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Cisco ASA 5500 Series Command Reference, 8.2
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About This Guide
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Using the Command Line Interface
- A through B Commands
- C Commands
- D through F Commands
- G through I Commands
- J through L Commands
- M through O Commands
- P through R Commands
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S Commands
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same-security-traffic -- show asdm sessions
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show asp drop -- show curpriv
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show ddns -- show ipv6 traffic
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show isakmp sa -- show route
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show running-config -- show running-config isakmp
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show running-config ldap -- show running-config webvpn auto-signon
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show service-policy -- show xlate
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shun -- sysopt radius ignore-secret
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- T through Z Commands
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Table Of Contents
undebug through zonelabs integrity ssl-client-authentication Commands
url-list (group-policy webvpn)
user-authentication-idle-timeout
validation-policy (crypto ca trustpoint)
vpn-sessiondb max-session-limit
vpn-sessiondb max-webvpn-session-limit
webvpn (group-policy and username modes)
zonelabs-integrity fail-timeout
zonelabs-integrity server-address
zonelabs-integrity ssl-certificate-port
zonelabs-integrity ssl-client-authentication
undebug through zonelabs integrity ssl-client-authentication Commands
urgent-flag
To allow or clear the URG pointer through the TCP normalizer, use the urgent-flag command in tcp-map configuration mode. To remove this specification, use the no form of this command.
urgent-flag {allow | clear}
no urgent-flag {allow | clear}
Syntax Description
allow
Allows the URG pointer through the TCP normalizer.
clear
Clears the URG pointer through the TCP normalizer.
Defaults
The urgent flag and urgent offset are clear by default.
Command Modes
The following table shows the modes in which you can enter the command:
Tcp-map configuration
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Command History
Usage Guidelines
The tcp-map command is used along with the Modular Policy Framework infrastructure. Define the class of traffic using the class-map command and customize the TCP inspection with tcp-map commands. Apply the newTCP map using the policy-map command. Activate TCP inspection with service-policy commands.
Use the tcp-map command to enter tcp-map configuration mode. Use the urgent-flag command in tcp-map configuration mode to allow the urgent flag.
The URG flag is used to indicate that the packet contains information that is of higher priority than other data within the stream. The TCP RFC is vague about the exact interpretation of the URG flag, therefore, end systems handle urgent offsets in different ways, which may make the end system vulnerable to attacks. The default behavior is to clear the URG flag and offset.
Examples
The following example shows how to allow the urgent flag:
hostname(config)# tcp-map tmaphostname(config-tcp-map)# urgent-flag allowhostname(config)# class-map cmaphostname(config-cmap)# match port tcp eq 513hostname(config)# policy-map pmaphostname(config-pmap)# class cmaphostname(config-pmap)# set connection advanced-options tmaphostname(config)# service-policy pmap globalRelated Commands
undebug
To disable the display of debug information in the current session, use the undebug command in privileged EXEC mode.
undebug {command | all}
Syntax Description
command
Disables debug for the specified command. See the Usage Guidelines for information about the supported commands.
all
Disables all debug output.
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Privileged EXEC
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Command History
Usage Guidelines
The following commands can be used with the undebug command. For more information about debugging a specific command, or for the associated arguments and keywords for a specific debug command, see the entry for debug command.
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Because debugging output is assigned high priority in the CPU process, it can render the system unusable. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco TAC. Moreover, it is best to use debug commands during periods of lower network traffic and fewer users. Debugging during these periods decreases the likelihood that increased debug command processing overhead will affect system use.
Examples
The example disabled all debug output:
hostname(config)# undebug allRelated Commands
unix-auth-gid
To set the UNIX group ID, use the unix-auth-gid command in group-policy webvpn configuration mode. To remove this command from the configuration, use the no version of this command.
unix-auth-gid <identifier>
no storage-objects
Syntax Description
Defaults
The default is 65534.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy webvpn configuration mode
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Command History
Usage Guidelines
The string specifies a network file system (NetFS) location. Only SMB and FTP protocols are supported; for example, smb://(NetFS location) or ftp://(NetFS location). You use the name of this location in the storage-objects command.
Examples
The following example sets the UNIX group ID to 4567:
hostname(config)# group-policy test attributeshostname(config-group-policy)# webvpnhostname(config-group-webvpn)# unix-auth-gid 4567Related Commands
unix-auth-uid
To set the UNIX user ID, use the unix-auth-uid command in group-policy webvpn configuration mode. To remove this command from the configuration, use the no version of this command.
unix-auth-gid <identifier>
no storage-objects
Syntax Description
Defaults
The default is 65534.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy webvpn configuration mode
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Command History
Usage Guidelines
The string specifies a network file system (NetFS) location. Only SMB and FTP protocols are supported; for example, smb://(NetFS location) or ftp://(NetFS location). You use the name of this location in the storage-objects command.
Examples
The following example sets the UNIX user ID to 333:
hostname(config)# group-policy test attributeshostname(config-group-policy)# webvpnhostname(config-group-webvpn)# unix-auth-gid 333Related Commands
upload-max-size
To specify the maximum size allowed for an object to upload, use the upload-max-size command in group-policy webvpn configuration mode. To remove this object from the configuration, use the no version of this command.
upload-max-size <size>
no upload-max-size
Syntax Description
Defaults
The default size is 2147483647.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy webvpn configuration mode
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Command History
Usage Guidelines
Setting the size to 0 effectively disallows object uploading.
Examples
The following example sets the maximum size for a uploaded object to 1500 bytes:
hostname(config)# group-policy test attributeshostname(config-group-policy)# webvpnhostname(config-group-webvpn)# upload-max-size 1500Related Commands
uri-non-sip
To identify the non-SIP URIs present in the Alert-Info and Call-Info header fields, use the uri-non-sip command in parameters configuration mode. Parameters configuration mode is accessible from policy map configuration mode. To disable this feature, use the no form of this command.
uri-non-sip action {mask | log} [log}
no uri-non-sip action {mask | log} [log}
Syntax Description
Defaults
This command is disabled by default.
Command Modes
The following table shows the modes in which you can enter the command:
Parameters configuration
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Examples
The following example shows how to identify the non-SIP URIs present in the Alert-Info and Call-Info header fields in a SIP inspection policy map:
hostname(config)# policy-map type inspect sip sip_maphostname(config-pmap)# parametershostname(config-pmap-p)# uri-non-sip action logRelated Commands
url
To maintain the list of static URLs for retrieving CRLs, use the url command in crl configure configuration mode. The crl configure configuration mode is accessible from the crypto ca trustpoint configuration mode. To delete an existing URL, use the no form of this command.
url index url
no url index url
Syntax Description
Defaults
No default behaviors or values.
Command Modes
The following table shows the modes in which you can enter the command:
CRL configure configuration
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Command History
Usage Guidelines
You cannot overwrite existing URLs. To replace an existing URL, first delete it using the no form of this command.
Examples
The following example enters ca-crl configuration mode, and sets up an index 3 for creating and maintaining a list of URLs for CRL retrieval and configures the URL https://foobin.com from which to retrieve CRLs:
hostname(configure)# crypto ca trustpoint centralhostname(ca-trustpoint)# crl configurehostname(ca-crl)# url 3 https://foobin.comhostname(ca-crl)#Related Commands
crl configure
Enters ca-crl configuration mode.
crypto ca trustpoint
Enters trustpoint configuration mode.
policy
Specifies the source for retrieving CRLs.
url-block
To manage the URL buffers used for web server responses while waiting for a filtering decision from the filtering server, use the url-block command. To remove the configuration, use the no form of this command.
url-block block block_buffer
no url-block block block_buffer
url-block mempool-size memory_pool_size
no url-block mempool-size memory_pool_size
url-block url-size long_url_size
no url-block url-size long_url_size
Syntax Description
Defaults
This command is disabled by default.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Command History
Usage Guidelines
For Websense filtering servers, the url-block url-size command allows filtering of long URLs, up to 4 KB. For Secure Computing, the url-block url-size command allows filtering of long URLs, up to 3 KB. For both Websense and N2H2 filtering servers, the url-block block command causes the adaptive security appliance to buffer packets received from a web server in response to a web client request while waiting for a response from the URL filtering server. This improves performance for the web client compared to the default adaptive security appliance behavior, which is to drop the packets and to require the web server to retransmit the packets if the connection is permitted.
If you use the url-block block command and the filtering server permits the connection, the adaptive security appliance sends the blocks to the web client from the HTTP response buffer and removes the blocks from the buffer. If the filtering server denies the connection, the adaptive security appliance sends a deny message to the web client and removes the blocks from the HTTP response buffer.
Use the url-block block command to specify the number of blocks to use for buffering web server responses while waiting for a filtering decision from the filtering server.
Use the url-block url-size command with the url-block mempool-size command to specify the maximum length of a URL to be filtered and the maximum memory to assign to the URL buffer. Use these commands to pass URLs longer than 1159 bytes, up to a maximum of 4096 bytes, to the Websense or Secure-Computing server. The url-block url-size command stores URLs longer than 1159 bytes in a buffer and then passes the URL to the Websense or Secure-Computing server (through a TCP packet stream) so that the Websense or Secure-Computing server can grant or deny access to that URL.
Examples
The following example assigns 56 1550-byte blocks for buffering responses from the URL filtering server:
hostname#(config)# url-block block 56Related Commands
url-cache
To enable URL caching for URL responses received from a Websense server and to set the size of the cache, use the url-cache command in global configuration mode. To remove the configuration, use the no form of this command.
url-cache { dst | src_dst } kbytes [ kb ]
no url-cache { dst | src_dst } kbytes [ kb ]
Syntax Description
Defaults
This command is disabled by default.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Usage Guidelines
Note
The url-cache command provides a configuration option to cache responses from the URL server.
Use the url-cache command to enable URL caching, set the size of the cache, and display cache statistics.
Caching stores URL access privileges in memory on the adaptive security appliance. When a host requests a connection, the adaptive security appliance first looks in the URL cache for matching access privileges instead of forwarding the request to the Websense server. Disable caching with the no url-cache command.
Note
Using the URL cache does not update the Websense accounting logs for Websense protocol Version 1. If you are using Websense protocol Version 1, let Websense run to accumulate logs so you can view the Websense accounting information. After you get a usage profile that meets your security needs, enable url-cache to increase throughput. Accounting logs are updated for Websense protocol Version 4 URL filtering while using the url-cache command.
Examples
The following example caches all outbound HTTP connections based on the source and destination addresses:
hostname(config)# url-cache src_dst 128Related Commands
url-entry
To enable or disable the ability to enter any HTTP/HTTPS URL on the portal page, use the url-entry command in dap webvpn configuration mode.
url-entry enable | disable
Defaults
No default value or behaviors.
Command Modes
The following table shows the modes in which you can enter the command:
Dap webvpn configuration
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Command History
Usage Guidelines
Examples
The following example shows how to enable URL entryfor the DAP record called Finance:
hostname (config) config-dynamic-access-policy-record Financehostname(config-dynamic-access-policy-record)# webvpnhostname(config-dynamic-access-policy-record)# url-entry enableRelated Commands
dynamic-access-policy-record
Creates a DAP record.
file-entry
Enables or disables the ability to enter file server names to access.
url-length-limit
To configure the maximum length of the URL allowed in the RTSP message, use the url-length-limit command in parameters configuration mode. Parameters configuration mode is accessible from policy map configuration mode. To disable this feature, use the no form of this command.
url-length-limit length
no url-length-limit length
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Parameters configuration
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Examples
The following example shows how to configure the URL length limit in an RTSP inspection policy map:
hostname(config)# policy-map type inspect rtsp rtsp_maphostname(config-pmap)# parametershostname(config-pmap-p)# url-length-limit 50Related Commands
url-list (removed)
You can no longer use this command to define URl lists for access over SSL VPN connections. Now use the import command to import the XML object that defines a URL list. See the import- and export-url-list commands for more information.
Defaults
There is no default URL list.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration mode
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Usage Guidelines
You use the url-list command in global configuration mode to create one or more lists of URLs. To allow access to the URLs in a list for a specific group policy or user, use the listname you create here with the url-list command in webvpn mode.
Examples
The following example shows how to create a URL list called Marketing URLs that provides access to www.cisco.com, www.example.com, and www.example.org. The following table provides values that the example uses for each application.
Marketing URLs
Cisco Systems
http://www.cisco.com
Marketing URLs
Example Company, Inc.
http://www.example.com
Marketing URLs
Example Organization
http://www.example.org
hostname(config)# url-list Marketing URLs Cisco Systems http://www.cisco.comhostname(config)# url-list Marketing URLs Example Company, Inc. http://www.example.comhostname(config)# url-list Marketing URLs Example Organization http://www.example.orgRelated Commands
url-list (group-policy webvpn)
To apply a list of WebVPN servers and URLs to a particular user or group policy, use the url-list command in group-policy webvpn configuration mode or in username webvpn configuration mode. To remove a list, including a null value created by using the url-list none command, use the no form of this command. The no option allows inheritance of a value from another group policy. To prevent inheriting a url list, use the url-list none command. Using the command a second time overrides the previous setting.
url-list {value name | none} [index]
no url-list
Syntax Description
Defaults
There is no default URL list.
Command Modes
The following table shows the modes in which you enter the commands:
Group-policy webvpn mode
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Usage Guidelines
Using the command a second time overrides the previous setting.
Before you can use the url-list command in webvpn mode to identify a URL list that you want to display on the WebVPN home page for a user or group policy, you must create the list via an XML object. Use the import command in global configuration mode to download a URL list to the security appliance. Then use the url-list command to apply a list to a particular group policy or user.
Examples
The following example applies a URL list called FirstGroupURLs for the group policy named FirstGroup and assigns it first place among the URL lists:
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# webvpnhostname(config-group-webvpn)# url-list value FirstGroupURLs 1Related Commands
url-server
To identify an N2H2 or Websense server for use with the filter command, use the url-server command in global configuration mode. To remove the configuration, use the no form of this command.
N2H2
url-server [<(if_name)>] vendor {smartfilter | n2h2} host <local_ip> [port <number>] [timeout <seconds>] [protocol {TCP [connections <number>]} | UDP]
no url-server [<(if_name)>] vendor {smartfilter | n2h2} host <local_ip> [port <number>] [timeout <seconds>] [protocol {TCP [connections <number>]} | UDP]
Websense
url-server (if_name) vendor websense host local_ip [timeout seconds] [protocol {TCP | UDP | connections num_conns] | version]
no url-server (if_name) vendor websense host local_ip [timeout seconds] [protocol {TCP | UDP [connections num_conns] | version]
Syntax Description
N2H2
Websense
Defaults
This command is disabled by default.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Usage Guidelines
The url-server command designates the server running the N2H2 or Websense URL filtering application. The limit is 16 URL servers in single context mode and 4 URL servers in multi mode; however, and you can use only one application at a time, either N2H2 or Websense. Additionally, changing your configuration on the adaptive security appliance does not update the configuration on the application server; this must be done separately, according to the vendor instructions.
The url-server command must be configured before issuing the filter command for HTTPS and FTP. If all URL servers are removed from the server list, then all filter commands related to URL filtering are also removed.
Once you designate the server, enable the URL filtering service with the filter url command.
Use the show url-server statistics command to view server statistic information including unreachable servers.
Follow these steps to filter URLs:
Step 1
Step 2
Step 3
Step 4
Step 5
For more information about Filtering by N2H2, visit N2H2's website at:
http://www.n2h2.com
For more information on Websense filtering services, visit the following website:
http://www.websense.com/
Examples
Using N2H2, the following example filters all outbound HTTP connections except those from the 10.0.2.54 host:
hostname(config)# url-server (perimeter) vendor n2h2 host 10.0.1.1hostname(config)# filter url http 0 0 0 0hostname(config)# filter url except 10.0.2.54 255.255.255.255 0 0Using Websense, the following example filters all outbound HTTP connections except those from the 10.0.2.54 host:
hostname(config)# url-server (perimeter) vendor websense host 10.0.1.1 protocol TCP version 4hostname(config)# filter url http 0 0 0 0hostname(config)# filter url except 10.0.2.54 255.255.255.255 0 0Related Commands
user-authentication
To enable user authentication, use the user-authentication enable command in group-policy configuration mode. To disable user authentication, use the user-authentication disable command. To remove the user authentication attribute from the running configuration, use the no form of this command. This option allows inheritance of a value for user authentication from another group policy.
When enabled, user authentication requires that individual users behind a hardware client authenticate to gain access to the network across the tunnel.
user-authentication {enable | disable}
no user-authentication
Syntax Description
Defaults
User authentication is disabled.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy
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Usage Guidelines
Individual users authenticate according to the order of authentication servers that you configure.
If you require user authentication on the primary adaptive security appliance, be sure to configure it on any backup servers as well.
Examples
The following example shows how to enable user authentication for the group policy named "FirstGroup":
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# user-authentication enableRelated Commands
user-authentication-idle-timeout
To set an idle timeout for individual users behind hardware clients, use the user-authentication-idle-timeout command in group-policy configuration mode. To delete the idle timeout value, use the no form of this command. This option allows inheritance of an idle timeout value from another group policy. To prevent inheriting an idle timeout value, use the user-authentication-idle-timeout none command.
If there is no communication activity by a user behind a hardware client in the idle timeout period, the adaptive security appliance terminates the connection.
user-authentication-idle-timeout {minutes | none}
no user-authentication-idle-timeout
Syntax Description
Defaults
30 minutes.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy
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Usage Guidelines
The minimum is 1 minute, the default is 30 minutes, and the maximum is 10,080 minutes.
This timer terminates only the client's access through the VPN tunnel, not the VPN tunnel itself.
The idle timeout indicated in response to the show uauth command is always the idle timeout value of the user who authenticated the tunnel on the Cisco Easy VPN remote device.
Examples
The following example shows how to set an idle timeout value of 45 minutes for the group policy named "FirstGroup":
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# user-authentication-idle-timeout 45Related Commands
user-authentication
Requires users behind hardware clients to identify themselves to the adaptive security appliance before connecting.
user-storage
To store personalized user information between clientless SSL VPN sessions, use the user storage command in group-policy webvpn mode. To disable user storage, use the no versionof the command.
user-storage NETFS-location
no user-storage]
Syntax Description
Defaults
User storage is disabled.
Command Modes
The following table shows the modes in which you can enter the command:
group-policy webvpn mode
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Usage Guidelines
Although the username, password, and preshared key are shown in the configuration, this poses no security risk because the adaptive security appliance stores this information in encrypted form, using an internal algorithm.
Examples
The following example shows how to set user storage for a user called newuser with a password of 12345678 at a file share called anyshare, and a path of anyfiler02a/new_share:
hostname(config)# wgroup-policy DFLTGrpPolicy attributeshostname(config-group-policy)# webvpnhostname(config-group-webvpn)# user-storage cifs://newuser:12345678@anyfiler02a/new_sharehostname(config-group_webvpn)#Related Commands
username
To add a user to the adaptive security appliance database, enter the username command in global configuration mode. To remove a user, use the no version of this command with the username you want to remove. To remove all usernames, use the no version of this command without appending a username.
username name {nopassword | password password [mschap | encrypted | nt-encrypted]} [privilege priv_level]
no username name
Syntax Description
Defaults
The default privilege level is 2.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Command History
7.0.1
This command was introduced.
7.2(1)
The mschap and nt-encrypted keywords were added.
Usage Guidelines
The login command uses this database for authentication.
If you add users to the local database who can gain access to the CLI and whom you do not want to enter privileged mode, you should enable command authorization. (See the aaa authorization command command.) Without command authorization, users can access privileged EXEC mode (and all commands) at the CLI using their own password if their privilege level is 2 or greater (2 is the default). Alternatively, you can use AAA authentication so the user will not be able to use the login command, or you can set all local users to level 1 so you can control who can use the enable password to access privileged EXEC mode.
By default, VPN users that you add with this command have no attributes or group policy association. You must configure all values explicitly using the username attributes command.
Examples
The following example shows how to configure a user named "anyuser" with a password of 12345678 and a privilege level of 12:
hostname(config)# username anyuser password 12345678 privilege 12Related Commands
username-from-certificate
To specify the field in a certificate to use as the username for authorization, use the username-from-certificate command in tunnel-group general-attributes mode. The DN of the peer certificate used as username for authorization
To remove the attribute from the configuration and restore default values, use the no form of this command.
username-from-certificate {primary-attr [secondary-attr] | use-entire-name}
no username-from-certificate
Syntax Description
Defaults
The default value for the primary attribute is CN (Common Name).
The default value for the secondary attribute is OU (Organization Unit).
Command Modes
The following table shows the modes in which you can enter the command:
Tunnel-group general-attributes configuration
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Usage Guidelines
This command selects the field in the certificate to use as the username. It replaces the deprecated authorization-dn-attributes command in Release 8.0.4 and following. The username-from-certificate command forces the security appliance to use the specified certificate field as the username for username/password authorization.
To use this derived username in the pre-fill username from certificate feature for username/passwordauthentication or authorization, you must also configure the pre-fill-username command in tunnel-group webvpn-attributes mode. That is, to use the pre-fill username feature, you must configure both commands.
Possible values for primary and secondary attributes include the following:
Examples
The following example, entered in global configuration mode, creates an IPSec remote access tunnel group named remotegrp and specifies the use of CN (Common Name) as the primary attribute and OU as the secondary attribute to use to derive a name for an authorization query from a digital certificate:
hostname(config)# tunnel-group remotegrp type ipsec_rahostname(config)# tunnel-group remotegrp general-attributeshostname(config-tunnel-general)# username-from-certificate CN OUhostname(config-tunnel-general)#Related Commands
username attributes
To enter the username attributes mode, use the username attributes command in username configuration mode. To remove all attributes for a particular user, use the no form of this command and append the username. To remove all attributes for all users, use the no form of this command without appending a username. The attributes mode lets you configure Attribute-Value Pairs for a specified user.
username {name} attributes
no username [name] attributes
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Username
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Usage Guidelines
The internal user authentication database consists of the users entered with the username command. The login command uses this database for authentication. You can configure the username attributes using either the username command or the username attributes command.
The syntax of the commands in config-username mode have the following characteristics in common:
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The username attributes command enters config-username mode, in which you can configure any of the following attributes:
You configure webvpn-mode attributes for the username by entering the username attributes command and then entering the webvpn command in username webvpn configuration mode. See the description of the webvpn command (group-policy attributes and username attributes modes) for details.
Examples
The following example shows how to enter username attributes configuration mode for a user named "anyuser":
hostname(config)# username anyuser attributeshostname(config-username)#Related Commands
username-prompt
To customize the username prompt of the WebVPN page login box that is displayed to WebVPN users when they connect to the security appliance, use the username-prompt command from webvpn customization mode:
username-prompt {text | style} value
[no] username-prompt {text | style} value
To remove the command from the configuration and cause the value to be inherited, use the no form of the command.
Syntax Description
Defaults
The default is text of the username prompt is "USERNAME:".
The default style of the username prompt is color:black;font-weight:bold;text-align:right.
Command Modes
The following table shows the modes in which you can enter the command:
Webvpn customization
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Command History
Usage Guidelines
The style option is expressed as any valid Cascading Style Sheet (CSS) parameters. Describing these parameters is beyond the scope of this document. For more information about CSS parameters, consult CSS specifications at the World Wide Web Consortium (W3C) website at www.w3.org. Appendix F of the CSS 2.1 Specification contains a convenient list of CSS parameters, and is available at www.w3.org/TR/CSS21/propidx.html.
Here are some tips for making the most common changes to the WebVPN pages—the page colors:
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Note
Examples
In the following example, the text is changed to "Corporate Username:", and the default style is changed with the font weight increased to bolder:
F1-asa1(config)# webvpnF1-asa1(config-webvpn)# customization ciscoF1-asa1(config-webvpn-custom)# username-prompt text Corporate Username:F1-asa1(config-webvpn-custom)# username-prompt style font-weight:bolderRelated Commands
group-prompt
Customizes the group prompt of the WebVPN page.
password-prompt
Customizes the password prompt of the WebVPN page.
user-alert
To enable broadcse an urgent message to all clientless SSL VPN users with currently active session, use the user-alert command in privileged EXEC mode. To disable the message, use the no form of this command.
user-alert string
no user-alert
Syntax Description
Defaults
No message.
Command Modes
The following table shows the modes in which you can enter the command:
Privileged EXEC
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Command History
Usage Guidelines
When you issue this command, end users see a pop-up browser window with the configured message. This command causes no change in the adaptive security appliance configuration file.
Examples
The following example shows how to enable DAP trace debugging:
hostname # We will reboot the security appliance at 11:00 p.m. EST time. We apologize for any inconvenience.hostname #user-message
To specify a text message to display when a DAP record is selected, use the user-message command in dynamic-access-policy-record mode. To remove this message, use the no version of the command. If you use the command more than once for the same DAP record, the newer message replaces the previous message.
user-message message
no user-message
Syntax Description
message
The message for users assigned to this DAP record. Maximum 128 characters. If the message contains spaces, enclose it in double quotation marks.
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Dynamic-access-policy- record
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Command History
Usage Guidelines
For a successful SSL VPN connection, the portal page displays a flashing, clickable icon that lets the user see the message(s) associated with the connection. If the connection is terminated from a DAP policy (action = terminate), and if there is a user message configured in that DAP record, then that message displays on the login screen.
If more than one DAP record applies to a connection, the adaptive security appliance combines the applicable user messages and displays them as a single string.
Examples
The following example shows how to set a user message of "Hello Money Managers" for the DAP record called Finance.
hostname (config) config-dynamic-access-policy-record Financehostname(config-dynamic-access-policy-record)# user-message "Hello Money Managers"hostname(config-dynamic-access-policy-record)#Related Commands
user-parameter
To specify the name of the HTTP POST request parameter in which a username must be submitted for SSO authentication, use the user-parameter command in aaa-server-host configuration mode. This is an SSO with HTTP Forms command.
user-parameter name
Note
Syntax Description
Syntax DescriptionSyntax Description
string
The name of the username parameter included in the HTTP POST request. The maximum name size is 128 characters.
Defaults
There is no default value or behavior.
Command Modes
The following table shows the modes in which you can enter the command:
Aaa-server-host configuration
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Command History
Usage Guidelines
The WebVPN server of the adaptive security appliance uses an HTTP POST request to submit a single sign-on authentication request to an SSO server. The required command user-parameter specifies that the HTTP POST request must include a username parameter for SSO authentication.
Note
Examples
The following example, entered in aaa-server-host configuration mode, specifies that the username parameter userid be included in the HTTP POST request used for SSO authentication:
hostname(config)# aaa-server testgrp1 host example.comhostname(config-aaa-server-host)# user-parameter useridhostname(config-aaa-server-host)#Related Commands
user-storage
To store personalized user information between clientless SSL VPN sessions, use the user storage command in group-policy webvpn mode. To disable user storage, use the no versionof the command.
user-storage NETFS-location
no user-storage]
Syntax Description
Defaults
User storage is disabled.
Command Modes
The following table shows the modes in which you can enter the command:
group-policy webvpn mode
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Command History
Usage Guidelines
Although the username, password, and preshared key are shown in the configuration, this poses no security risk because the adaptive security appliance stores this information in encrypted form, using an internal algorithm.
Examples
The following example shows how to set user storage for a user called newuser with a password of 12345678 at a file share called anyshare, and a path of anyfiler02a/new_share:
hostname(config)# wgroup-policy DFLTGrpPolicy attributeshostname(config-group-policy)# webvpnhostname(config-group-webvpn)# user-storage cifs://newuser:12345678@anyfiler02a/new_sharehostname(config-group_webvpn)#Related Commands
validate-attribute
To validate RADIUS attributes when using RADIUS accounting, use the validate attribute command in radius-accounting parameter configuration mode, which is accessed by using the inspect radius-accounting command.
This option is disabled by default.
validate-attribute [attribute_number]
no validate-attribute [attribute_number]
Syntax Description
attribute_number
The RADIUS attribute to be validated with RADIUS accounting. Values range from 1-191. Vendor Specific Attributes are not supported.
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
radius-accounting parameter configuration
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Command History
Usage Guidelines
When this command is configured, the security appliance will also do a match on these attributes in addition to the Framed IP attribute. Multiple instances of this command are allowed.
You can find a list of RADIUS attribute types here:
http://www.iana.org/assignments/radius-types
Examples
The following example shows how to enable RADIUS accounting for the user name RADIUS attribute:
hostname(config)# policy-map type inspect radius-accounting rahostname(config-pmap)# parametershostname(config-pmap-p)# validate attribute 1Related Commands
inspect radius-accounting
Sets inspection for RADIUS accounting.
parameters
Sets parameters for an inspection policy map.
validation-policy (crypto ca trustpoint)
To specify the conditions under which a trustpoint can be used to validate the certificates associated with an incoming user connection, use the validation-policy command in crypto ca trustpoint configuration mode. To specify that the trustpoint cannot be used for the named condition, use the no form of the command.
[no] validation-policy {ssl | ipsec} [no-chain] [subordinate-only]
Syntax Description
Defaults
No default value or behavior.
Command Modes
The following table shows the modes in which you can enter the command:
Command History
Crypto ca trustpoint configuration
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Usage Guidelines
Remote-access VPNs can use Secure Sockets Layer (SSL) VPN, IP Security (IPSec), or both, depending on deployment requirements, to permit access to virtually any network application or resource. The validation-policy command allows you to specify the protocol type permitted to access on-board CA certificates.
The no-chain option with this command prevents a security applicance from supporting subordinate CA certificates that are not configured as trustpoints on the security appliance.
The security appliance can have two trustpoints with the same CA resulting in two different identity certificates from the same CA. This option is disabled automatically if the trustpoint is authenticated to a CA that is already associated with another trustpoint that has enabled this feature. This prevents ambiguity in the choice of path-validation parameters. If the user attempts to activate this feature on a trustpoint that has been authenticated to a CA already associated with another trustpoint that has enabled this feature, the action is not permitted. No two trustpoints can have this setting enabled and be authenticated to the same CA.
Examples
The following example enters crypto ca trustpoint configuration mode for trustpoint, central, and designates it an SSL trustpoint:
hostname(config)# crypto ca trustpoint centralhostname(config-ca-trustpoint)# validation-policy sslhostname(config-ca-trustpoint)#The following example enters crypto ca trustpoint configuration mode for trustpoint, checkin1,and sets it to accept certificates that are subordinate to the specified trustpoint.
hostname(config)# crypto ca trustpoint checkin1hostname(config-ca-trustpoint)# validation-policy subordinates-onlyhostname(config-ca-trustpoint)#Related Commands
verify
To verify the checksum of a file, use the verify command in privileged EXEC mode.
verify path
verify /md5 path [md5-value]
Syntax Description
Defaults
The current flash device is the default file system.
Note
Command Modes
The following table shows the modes in which you can enter the command:
Privileged EXEC
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Command History
Usage Guidelines
Use the verify command to verify the checksum of a file before using it.
Each software image that is distributed on disk uses a single checksum for the entire image. This checksum is displayed only when the image is copied into Flash memory; it is not displayed when the image file is copied from one disk to another.
Before loading or duplicating a new image, record the checksum and MD5 information for the image so that you can verify the checksum when you copy the image into Flash memory or onto a server. A variety of image information is available on Cisco.com.
To display the contents of Flash memory, use the show flash command. The Flash contents listing does not include the checksum of individual files. To recompute and verify the image checksum after the image has been copied into Flash memory, use the verify command. Note, however, that the verify command only performs a check on the integrity of the file after it has been saved in the file system. It is possible for a corrupt image to be transferred to the security appliance and saved in the file system without detection. If a corrupt image is transferred successfully to the security appliance, the software will be unable to tell that the image is corrupted and the file will verify successfully.
To use the message-digest5 (MD5) hash algorithm to ensure file validation, use the verify command with the /md5 option. MD5 is an algorithm (defined in RFC 1321) that is used to verify data integrity through the creation of a unique 128-bit message digest. The /md5 option of the verify command allows you to check the integrity of the security appliance software image by comparing its MD5 checksum value against a known MD5 checksum value for the image. MD5 values are now made available on Cisco.com for all security appliance software images for comparison against local system image values.
To perform the MD5 integrity check, issue the verify command using the /md5 keyword. For example, issuing the verify /md5 flash:cdisk.bin command will calculate and display the MD5 value for the software image. Compare this value with the value available on Cisco.com for this image.
Alternatively, you can get the MD5 value from Cisco.com first, then specify this value in the command syntax. For example, issuing the verify /md5 flash:cdisk.bin 8b5f3062c4cacdbae72571440e962233 command will display a message verifying that the MD5 values match or that there is a mismatch. A mismatch in MD5 values means that either the image is corrupt or the wrong MD5 value was entered.
Examples
The following example shows the verify command used on an image file called cdisk.bin. Some of the text was removed for clarity:
hostname# verify cdisk.bin!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Done!Embedded Hash MD5: af5a155f3d5c128a271282c33277069bComputed Hash MD5: af5a155f3d5c128a271282c33277069bCCO Hash MD5: b569fff8bbf8087f355aaf22ef46b782Signature VerifiedVerified disk0:/cdisk.binhostname#Related Commands
version
To specify the version of RIP used globally by the adaptive security appliance, use the version command in router configuration mode. To restore the defaults, use the no form of this command.
version {1 | 2}
no version
Syntax Description
Defaults
The adaptive security appliance accepts Version 1 and Version 2 packets but sends only Version 1 packets.
Command Modes
The following table shows the modes in which you can enter the command:
Router configuration
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Command History
Usage Guidelines
You can override the global setting on a per-interface basis by entering the rip send version and rip receive version commands on an interface.
If you specify RIP version 2, you can enable neighbor authentication and use MD5-based encryption to authenticate the RIP updates.
Examples
The following example configures the adaptive security appliance to send and receive RIP Version 2 packets on all interfaces:
hostname(config)# router riphostname(config-router)# network 10.0.0.0hostname(config-router)# version 2Related Commands
virtual http
To configure a virtual HTTP server, use the virtual http command in global configuration mode. To disable the virtual server, use the no form of this command.
virtual http ip_address [warning]
no virtual http ip_address [warning]
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Command History
Usage Guidelines
When you use HTTP authentication on the adaptive security appliance (see the aaa authentication match or the aaa authentication include command), the adaptive security appliance uses basic HTTP authentication by default. You can change the authentication method so that the adaptive security appliance redirects HTTP connections to web pages generated by the adaptive security appliance itself using the aaa authentication listener command with the redirect keyword.
However, if you continue to use basic HTTP authentication, then you might need the virtual http command when you have cascading HTTP authentications.
If the destination HTTP server requires authentication in addition to the adaptive security appliance, then the virtual http command lets you authenticate separately with the adaptive security appliance (via a AAA server) and with the HTTP server. Without virtual HTTP, the same username and password you used to authenticate with the adaptive security appliance is sent to the HTTP server; you are not prompted separately for the HTTP server username and password. Assuming the username and password is not the same for the AAA and HTTP servers, then the HTTP authentication fails.
This command redirects all HTTP connections that require AAA authentication to the virtual HTTP server on the adaptive security appliance. The adaptive security appliance prompts for the AAA server username and password. After the AAA server authenticates the user, the adaptive security appliance redirects the HTTP connection back to the original server, but it does not include the AAA server username and password. Because the username and password are not included in the HTTP packet, the HTTP server prompts the user separately for the HTTP server username and password.
For inbound users (from lower security to higher security), you must also include the virtual HTTP address as a destination interface in the access list applied to the source interface. Moreover, you must add a static command for the virtual HTTP IP address, even if NAT is not required (using the no nat-control command). An identity NAT command is typically used (where you translate the address to itself).
For outbound users, there is an explicit permit for traffic, but if you apply an access list to an inside interface, be sure to allow access to the virtual HTTP address. A static statement is not required.
Note
Examples
The following example shows how to enable virtual HTTP along with AAA authentication:
hostname(config)# virtual http 209.165.202.129hostname(config)# access-list ACL-IN extended permit tcp any host 209.165.200.225 eq httphostname(config)# access-list ACL-IN remark This is the HTTP server on the insidehostname(config)# access-list ACL-IN extended permit tcp any host 209.165.202.129 eq httphostname(config)# access-list ACL-IN remark This is the virtual HTTP addresshostname(config)# access-group ACL-IN in interface outsidehostname(config)# static (inside, outside) 209.165.202.129 209.165.202.129 netmask 255.255.255.255hostname(config)# access-list AUTH extended permit tcp any host 209.165.200.225 eq httphostname(config)# access-list AUTH remark This is the HTTP server on the insidehostname(config)# access-list AUTH extended permit tcp any host 209.165.202.129 eq httphostname(config)# access-list AUTH remark This is the virtual HTTP addresshostname(config)# aaa authentication match AUTH outside tacacs+Related Commands
virtual telnet
To configure a virtual Telnet server on the adaptive security appliance, use the virtual telnet command in global configuration mode. You might need to authenticate users with the virtual Telnet server if you require authentication for other types of traffic for which the adaptive security appliance does not supply an authentication prompt. To disable the server, use the no form of this command.
virtual telnet ip_address
no virtual telnet ip_address
Syntax Description
ip_address
Sets the IP address for the virtual Telnet server on the adaptive security appliance. Make sure this address is an unused address that is routed to the adaptive security appliance.
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Command History
Usage Guidelines
Although you can configure network access authentication for any protocol or service (see the aaa authentication match or aaa authentication include command), you can authenticate directly with HTTP, Telnet, or FTP only. A user must first authenticate with one of these services before other traffic that requires authentication is allowed through. If you do not want to allow HTTP, Telnet, or FTP through the adaptive security appliance, but want to authenticate other types of traffic, you can configure virtual Telnet; the user Telnets to a given IP address configured on the adaptive security appliance, and the adaptive security appliance provides a Telnet prompt.
You must configure authentication for Telnet access to the virtual Telnet address as well as the other services you want to authenticate using the authentication match or aaa authentication include command.
When an unauthenticated user connects to the virtual Telnet IP address, the user is challenged for a username and password, and then authenticated by the AAA server. Once authenticated, the user sees the message "Authentication Successful." Then, the user can successfully access other services that require authentication.
For inbound users (from lower security to higher security), you must also include the virtual Telnet address as a destination interface in the access list applied to the source interface. Moreover, you must add a static command for the virtual Telnet IP address, even if NAT is not required (using the no nat-control command). An identity NAT command is typically used (where you translate the address to itself).
For outbound users, there is an explicit permit for traffic, but if you apply an access list to an inside interface, be sure to allow access to the virtual Telnet address. A static statement is not required.
To logout from the adaptive security appliance, reconnect to the virtual Telnet IP address; you are prompted to log out.
Examples
This example shows how to enable virtual Telnet along with AAA authentication for other services:
hostname(config)# virtual telnet 209.165.202.129hostname(config)# access-list ACL-IN extended permit tcp any host 209.165.200.225 eq smtphostname(config)# access-list ACL-IN remark This is the SMTP server on the insidehostname(config)# access-list ACL-IN extended permit tcp any host 209.165.202.129 eq telnethostname(config)# access-list ACL-IN remark This is the virtual Telnet addresshostname(config)# access-group ACL-IN in interface outsidehostname(config)# static (inside, outside) 209.165.202.129 209.165.202.129 netmask 255.255.255.255hostname(config)# access-list AUTH extended permit tcp any host 209.165.200.225 eq smtphostname(config)# access-list AUTH remark This is the SMTP server on the insidehostname(config)# access-list AUTH extended permit tcp any host 209.165.202.129 eq telnethostname(config)# access-list AUTH remark This is the virtual Telnet addresshostname(config)# aaa authentication match AUTH outside tacacs+Related Commands
vlan
To assign a VLAN ID to a subinterface, use the vlan command in interface configuration mode. To remove a VLAN ID, use the no form of this command. Subinterfaces require a VLAN ID to pass traffic. VLAN subinterfaces let you configure multiple logical interfaces on a single physical interface. VLANs let you keep traffic separate on a given physical interface, for example, for multiple security contexts.
vlan id
no vlan
Syntax Description
id
Specifies an integer between 1 and 4094. Some VLAN IDs might be reserved on connected switches, so check the switch documentation for more information.
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Interface configuration
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Command History
7.0(1)
This command was moved from a keyword of the interface command to an interface configuration mode command.
Usage Guidelines
You can only assign a single VLAN to a subinterface, and not to the physical interface. Each subinterface must have a VLAN ID before it can pass traffic. To change a VLAN ID, you do not need to remove the old VLAN ID with the no option; you can enter the vlan command with a different VLAN ID, and the adaptive security appliance changes the old ID.
You need to enable the physical interface with the no shutdown command to let subinterfaces be enabled. If you enable subinterfaces, you typically do not also want the physical interface to pass traffic, because the physical interface passes untagged packets. Therefore, you cannot prevent traffic from passing through the physical interface by bringing down the interface. Instead, ensure that the physical interface does not pass traffic by leaving out the nameif command. If you want to let the physical interface pass untagged packets, you can configure the nameif command as usual.
The maximum number of subinterfaces varies depending on your platform. See the Cisco ASA 5500 Series Configuration Guide using the CLI for the maximum subinterfaces per platform.
Examples
The following example assigns VLAN 101 to a subinterface:
hostname(config)# interface gigabitethernet0/0.1hostname(config-subif)# vlan 101hostname(config-subif)# nameif dmz1hostname(config-subif)# security-level 50hostname(config-subif)# ip address 10.1.2.1 255.255.255.0hostname(config-subif)# no shutdownThe following example changes the VLAN to 102:
hostname(config)# show running-config interface gigabitethernet0/0.1interface GigabitEthernet0/0.1vlan 101nameif dmz1security-level 50ip address 10.1.2.1 255.255.255.0hostname(config)# interface gigabitethernet0/0.1hostname(config-interface)# vlan 102hostname(config)# show running-config interface gigabitethernet0/0.1interface GigabitEthernet0/0.1vlan 102nameif dmz1security-level 50ip address 10.1.2.1 255.255.255.0Related Commands
vlan (group-policy)
To assign a VLAN to a group policy, use the vlan command in group-policy configuration mode. To remove the VLAN from the configuration of the group policy and replace it with the VLAN setting of the default group policy, use the no form of this command.
[no] vlan {vlan_id |none}
Syntax Description
Defaults
The default value is none.
Command Modes
The following table shows the modes in which you can enter the command:
group-policy configuration
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Usage Guidelines
This command specifies the egress VLAN interface for sessions assigned to this group policy. The adaptive security appliance forwards all traffic on this group to that VLAN. You can assign a VLAN to each group policy to simplify access control. Use this command as an alternative to using ACLs to filter traffic on a session.
Examples
The following command assigns the VLAN 1 to the group policy:
hostname(config-group-policy)# vlan 1hostname(config-group-policy)The following command removes VLAN mapping from the group policy:
hostname(config-group-policy)# vlan nonehostname(config-group-policy)Related Commands
vpdn group
To create or edit a vpdn group and configure PPPoE client settings, use the vpdn group command in global configuration mode. To remove a group policy from the configuration, use the no form of this command.
vpdn group group_name {localname username | request dialout pppoe | ppp authentication {chap | mschap | pap}}
no vpdn group group_name {localname name | request dialout pppoe | ppp authentication {chap | mschap | pap}}
Note
Syntax Description
Defaults
default behavior or values. See Usage Guidelines.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Usage Guidelines
Virtual Private Dial-up Networking (VPDN) is used to provide long distance, point-to-point connections between remote dial-in users and a private network. VDPN on the security appliance uses the Layer 2 tunnelling technology PPPoE to establish dial-up networking connections from the remote user to the private network across a public network.
PPPoE is the Point-to-Point Protocol (PPP) over Ethernet. PPP is designed to work with network layer protocols such as IP, IPX, and ARA. PPP also has CHAP and PAP as built-in security mechanisms.
The show vpdn session pppoe command displays session information for PPPOE connections. The clear configure vpdn group command removes all vpdn group commands from the configuration and stops all the active L2TP and PPPoE tunnels. The clear configure vpdn username command removes all the vpdn username commands from the configuration.
Because PPPoE encapsulates PPP, PPPoE relies on PPP to perform authentication and ECP and CCP functions for client sessions operating within the VPN tunnel. Additionally, PPPoE is not supported in conjunction with DHCP because PPP assigns the IP address for PPPoE.
Note
To define a VPDN group to be used for PPPoE, use the vpdn group group_name request dialout pppoe command. Then use the pppoe client vpdn group command from interface configuration mode to associate a VPDN group with a PPPoE client on a particular interface.
If your ISP requires authentication, use the vpdn group group_name ppp authentication {chap | mschap | pap} command to select the authentication protocol used by your ISP.
Use the vpdn group group_name localname username command to associate the username assigned by your ISP with the VPDN group.
Use the vpdn username username password password command to create a username and password pair for the PPPoE connection. The username must be a username that is already associated with the VPDN group specified for PPPoE.
Note
The PPPoE client functionality is turned off by default, so after VPDN configuration, enable PPPoE with the ip address if_name pppoe [setroute] command. The setroute option causes a default route to be created if no default route exists.
As soon as PPPoE is configured, the security appliance attempts to find a PPPoE access concentrator with which to communicate. When a PPPoE connection is terminated, either normally or abnormally, the security appliance attempts to find a new access concentrator with which to communicate.
The following ip address commands should not be used after a PPPoE session is initiated because they will terminate the PPPoE session:
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Examples
The following example creates a vdpn group telecommuters and configures the PPPoE client:
F1(config)# vpdn group telecommuters request dialout pppoeF1(config)# vpdn group telecommuters localname user1F1(config)# vpdn group telecommuters ppp authentication papF1(config)# vpdn username user1 password test1F1(config)# interface GigabitEthernet 0/1F1(config-subif)# ip address pppoe setrouteRelated Commands
vpdn username
To create a username and password pair for PPPoE connections, use the vpdn username command in global configuration mode.
vpdn username username password password [store-local]
no vpdn username username password password [store-local]
Note
Syntax Description
Defaults
No default behavior or values. See Usage Guidelines.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Command History
Usage Guidelines
The vpdn username must be a username that is already associated with the VPDN group specified with the vpdn group group_name localname username command.
The clear configure vpdn username command removes all the vpdn username commands from the configuration.
Examples
The following example creates the vpdn username bob_smith with the password telecommuter9/8:
F1(config)# vpdn username bob_smith password telecommuter9/8Related Commands
vpn-access-hours
To associate a group policy with a configured time-range policy, use the vpn-access-hours command in group-policy configuration mode or username configuration mode. To remove the attribute from the running configuration, use the no form of this command. This option allows inheritance of a time-range value from another group policy. To prevent inheriting a value, use the vpn-access-hours none command.
vpn-access hours value {time-range} | none
no vpn-access hours
Syntax Description
Defaults
Unrestricted.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy
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Command History
Examples
The following example shows how to associate the group policy named FirstGroup with a time-range policy called 824:
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# vpn-access-hours 824Related Commands
time-range
Sets days of the week and hours of the day for access to the network, including start and end dates.
vpn-addr-assign
To specify a method for assigning IP addresses to remote access clients, use the vpn-addr-assign command in global configuration mode. To remove the attribute from the configuration, use the no version of this command. To remove all configured VPN address assignment methods from the adaptive security appliance, user the no version of this command. without arguments.
vpn-addr-assign {aaa | dhcp | local [reuse-delay delay]}
no vpn-addr-assign {aaa | dhcp | local [reuse-delay delay]}
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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Command History
7.0(1)
This command was introduced.
8.0.3
The reuse-delay option was introduced.
Usage Guidelines
If you choose DHCP, you should also use the dhcp-network-scope command to define the range of IP addresses that the DHCP server can use. You must use the dhcp-server command to indicate the IP addresses that the DHCP server uses.
If you choose local, you must also use the ip-local-pool command to define the range of IP addresses to use. You then use the vpn-framed-ip-address and vpn-framed-netmask commands to assign IP addresses and netmasks to individual users.
With the local pool, you can use the reuse-delay delay option to adjust the delay before a released IP address can be reused. Increasing the delay prevents problems firewalls may experience when an IP address is returned to the pool and reassigned quickly.
If you choose AAA, you obtain IP addresses from either a previously configured RADIUS server.
Examples
The following example shows how to configure DHCP as the address assignment method:
hostname(config)# vpn-addr-assign dhcpRelated Commands
vpn-filter
To specify the name of the ACL to use for VPN connections, use the vpn-filter command in group policy or username mode. To remove the ACL, including a null value created by issuing the vpn-filter none command, use the no form of this command. The no option allows inheritance of a value from another group policy. To prevent inheriting values, use the vpn-filter none command.
You configure ACLs to permit or deny various types of traffic for this user or group policy. You then use the vpn-filter command to apply those ACLs.
vpn-filter {value ACL name | none}
no vpn-filter
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy
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•
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Username
•
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•
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Command History
Usage Guidelines
Clientless SSL VPN does not use the ACL defined in the vpn-filter command.
Examples
The following example shows how to set a filter that invokes an access list named acl_vpn for the group policy named FirstGroup:
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# vpn-filter value acl_vpnRelated Commands
vpn-framed-ip-address
To specify the IP address to assign to a particular user, use the vpn-framed-ip-address command in username mode. To remove the IP address, use the no form of this command.
vpn-framed-ip-address {ip_address} {subnet_mask}
no vpn-framed-ip-address
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Username
•
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•
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Command History
Examples
The following example shows how to set an IP address of 10.92.166.7 for a user named anyuser:
hostname(config)# username anyuser attributeshostname(config-username)# vpn-framed-ip-address 10.92.166.7 255.255.255.254vpn-group-policy
To have a user inherit attributes from a configured group policy, use the vpn-group-policy command in username configuration mode. To remove a group policy from a user configuration, use the no version of this command. Using this command lets users inherit attributes that you have not configured at the username level.
vpn-group-policy {group-policy name}
no vpn-group-policy {group-policy name}
Syntax Description
Defaults
By default, VPN users have no group policy association.
Command Modes
The following table shows the modes in which you can enter the command:
Username
•
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•
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Command History
Usage Guidelines
You can override the value of an attribute in a group policy for a particular user by configuring it in username mode, if that attribute is available in username mode.
Examples
The following example shows how to configure a user named anyuser to use attributes from the group policy named FirstGroup:
hostname(config)# username anyuser attributeshostname(config-username)# vpn-group-policy FirstGroupRelated Commands
vpn-idle-timeout
To configure a user timeout period use the vpn-idle-timeout command in group-policy configuration mode or in username configuration mode. If there is no communication activity on the connection in this period, the adaptive security appliance terminates the connection.
To remove the attribute from the running configuration, use the no form of this command. This option allows inheritance of a time-out value from another group policy. To prevent inheriting a value, use the vpn-idle-timeout none command.
vpn-idle-timeout {minutes | none}
no vpn-idle-timeout
Syntax Description
Defaults
30 minutes.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy
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•
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Username
•
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•
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Command History
Examples
The following example shows how to set a VPN idle timeout of 15 minutes for the group policy named "FirstGroup":
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# vpn-idle-timeout 30Related Commands
vpn load-balancing
To enter vpn load-balancing mode, in which you can configure VPN load balancing and related functions, use the vpn load-balancing command in global configuration mode.
vpn load-balancing
Note
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration mode
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•
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Command History
7.0(1)
This command was introduced.
8.0(2)
Added support for ASA Model 5510 with a Plus license and models above 5520.
Usage Guidelines
A load-balancing cluster can include security appliance models 5510 (with a Plus license), or ASA 5520 and above. You can also include VPN 3000 Series Concentrators in the cluster. While mixed configurations are possible, administration is generally simpler if the cluster is homogeneous.
Use the vpn load-balancing command to enter vpn load-balancing mode. The following commands are available in vpn load-balancing mode:
•
•
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•
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•
See the individual command descriptions for detailed information.
Examples
The following is an example of the vpn load-balancing command; note the change in the prompt:
hostname(config)# vpn load-balancinghostname(config-load-balancing)#The following is an example of a VPN load-balancing command sequence that includes an interface command that specifies the public interface of the cluster as "test" and the private interface of the cluster as "foo":
hostname(config)# interface GigabitEthernet 0/1hostname(config-if)# ip address 209.165.202.159 255.255.255.0hostname(config)# nameif testhostname(config)# interface GigabitEthernet 0/2hostname(config-if)# ip address 209.165.201.30 255.255.255.0hostname(config)# nameif foohostname(config)# vpn load-balancinghostname(config-load-balancing)# nat 192.168.10.10hostname(config-load-balancing)# priority 9hostname(config-load-balancing)# interface lbpublic testhostname(config-load-balancing)# interface lbprivate foohostname(config-load-balancing)# cluster ip address 209.165.202.224hostname(config-load-balancing)# cluster key 123456789hostname(config-load-balancing)# cluster encryptionhostname(config-load-balancing)# cluster port 9023hostname(config-load-balancing)# participate
vpn-sessiondb logoff
To log off all or selected VPN sessions, use the vpn-sessiondb logoff command in global configuration mode.
vpn-sessiondb logoff {remote | l2l | webvpn | email-proxy | protocol protocol-name | name username | ipaddress IPaddr | tunnel-group groupname | index indexnumber | all}
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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•
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Command History
Examples
The following example shows how to log off all remote-access sessions:
hostname# vpn-sessiondb logoff remoteThe next example shows how to log off all IPSec sessions:
hostname# vpn-sessiondb logoff protocol IPSec
vpn-sessiondb max-session-limit
To limit VPN sessions to a lower value than the adaptive security appliance allows, use the vpn-sessiondb max-session-limit command in global configuration mode. To remove the session limit, use the no version of this command. To overwrite the current setting, use the command again.
vpn-sessiondb max-session-limit {session-limit}
no vpn-sessiondb max-session-limit
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
•
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•
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Command History
Usage Guidelines
This command applies to IPSec VPN sessions,.
Examples
The following example shows how to set a maximum VPN session limit of 450:
hostname# vpn-sessiondb max-session-limit 450Related Commands
vpn-sessiondb logoff
Logs off all or specific types of IPsec VPN and WebVPN sessions.
vpn-sessiondb max-webvpn-session-limit
Sets a maximum number of WebVPN sessions.
vpn-sessiondb max-webvpn-session-limit
To limit SSL VPN sessions to a lower value than the adaptive security appliance allows, use the vpn-sessiondb max-webvpn-session-limit command in global configuration mode. To remove the session limit, use the no version of this command. To overwrite the current setting, use the command again.
vpn-sessiondb max-webvpn-session-limit {session-limit}
no vpn-sessiondb max-webvpn-session-limit
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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•
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Command History
Usage Guidelines
This command applies to SSL VPN sessions, including AnyConnect VPN Client, legacy SSL VPN Client (SVC), and clientless (formerly WebVPN) session.
Examples
The following example shows how to set a maximum session limit of 75:
hostname (config)# vpn-sessiondb max-webvpn-session-limit 75Related Commands
vpn-sessiondb logoff
Logs off all or specific types of IPsec VPN and SSL VPN sessions.
vpn-sessiondb max-vpn-session-limit
Sets a maximum number of VPN sessions.
vpn-session-timeout
To configure a maximum amount of time allowed for VPN connections, use the vpn-session-timeout command in group-policy configuration mode or in username configuration mode. At the end of this period of time, the adaptive security appliance terminates the connection.
To remove the attribute from the running configuration, use the no form of this command. This option allows inheritance of a time-out value from another group policy. To prevent inheriting a value, use the vpn-session-timeout none command.
vpn-session-timeout {minutes | none}
no vpn-session-timeout
Syntax Description
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy
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Username
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Command History
Examples
The following example shows how to set a VPN session timeout of 180 minutes for the group policy named FirstGroup:
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# vpn-session-timeout 180Related Commands
vpn-simultaneous-logins
To configure the number of simultaneous logins permitted for a user, use the vpn-simultaneous-logins command in group-policy configuration mode or username configuration mode. To remove the attribute from the running configuration, use the no form of this command. This option allows inheritance of a value from another group policy. Enter 0 to disable login and prevent user access.
vpn-simultaneous-logins {integer}
no vpn-simultaneous-logins
Syntax Description
Defaults
The default is 3 simultaneous logins.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy
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Username
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Command History
Usage Guidelines
Enter 0 to disable login and prevent user access.
Note
Stale AnyConnect, IPSec Client, or Clientless sessions (sessions that are terminated abnormally) might remain in the session database, even though a "new" session has been established with the same username.
If the value of vpn-simultaneous-logins is 1, and the same user logs in again after an abnormal termination, then the stale session is removed from the database and the new session is established. If, however, the existing session is still an active connection and the same user logs in again, perhaps from another PC, the first session is logged off and removed from the database, and the new session is established.
If the number of simultaneous logins is a value greater than 1, then, when you have reached that maximum number and try to log in again, the session with the longest idle time is logged off. If all current sessions have been idle an equally long time, then the oldest session is logged off. This action frees up a session and allows the new login.
Examples
The following example shows how to allow a maximum of 4 simultaneous logins for the group policy named FirstGroup:
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# vpn-simultaneous-logins 4vpn-tunnel-protocol
To configure a VPN tunnel type (IPSec, L2TP over IPSec, SVC, or WebVPN), use the vpn-tunnel-protocol command in group-policy configuration mode or username configuration mode. To remove the attribute from the running configuration, use the no form of this command.
vpn-tunnel-protocol {IPSec | l2tp-ipsec | svc | webvpn}
no vpn-tunnel-protocol {IPSec | l2tp-ipsec | svc | webvpn}
Syntax Description
Defaults
The default is IPSec.
Command Modes
The following table shows the modes in which you can enter the command:
Group-policy configuration
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Username configuration
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Command History
7.0(1)
This command was introduced.
7.2(1)
The l2tp-ipsec keyword was added.
7.3(1)
The svc keyword was added.
Usage Guidelines
Use this command to configure one or more tunneling modes. You must configure at least one tunneling mode for users to connect over a VPN tunnel.
Note
Examples
The following example shows how to configure WebVPN and IPSec tunneling modes for the group policy named "FirstGroup":
hostname(config)# group-policy FirstGroup attributeshostname(config-group-policy)# vpn-tunnel-protocol webvpnhostname(config-group-policy)# vpn-tunnel-protocol IPSecRelated Commands
vpnclient connect
To attempt to establish an Easy VPN Remote connection to the configured server or servers, use the vpnclient connect command in global configuration mode.
vpnclient connect
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
EXEC
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Global configuration
•
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Command History
Usage Guidelines
This command applies only to the ASA model 5505.
Examples
The following example shows how to attempt to establish an Easy VPN Remote connection to a configured EasyVPN server:
hostname(config)# vpnclient connecthostname(config)#vpnclient disconnect
To disconnect Easy VPN Remote connection, use the vpnclient disconnect command in global configuration mode.
vpnclient disconnect
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
EXEC
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•
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Global configuration
•
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•
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Command History
Usage Guidelines
This command applies only to the ASA model 5505.
Examples
The following example shows how to disconnect an Easy VPN Remote connection:
hostname(config)# vpnclient disconnecthostname(config)#vpnclient enable
To enable the Easy VPN Remote feature, use the vpnclient enable command in global configuration mode. To disable the Easy VPN Remote feature, use the no form of this command:
vpnclient enable
no vpnclient enable
Defaults
No default behavior or values.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
•
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•
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Command History
Usage Guidelines
This command applies only to the ASA 5505.
If you enter the vpnclient enable command, the ASA 5505 functions as a Easy VPN hardware client (also called "Easy VPN Remote"). If you enter the vpnclient enable command, it functions as an Easy VPN server (also called a "headend"). It can function only as a client or a server.
Examples
The following example shows how to enable the Easy VPN Remote feature:
hostname(config)# vpnclient enablehostname(config)#The following example shows how to disable the Easy VPN Remote feature:
hostname(config)# no vpnclient enablehostname(config)#vpnclient ipsec-over-tcp
To configure the ASA 5505 running as an Easy VPN hardware client to use TCP-encapsulated IPSec, use the vpnclient ipsec-over-tcp command in global configuration mode. To remove the attribute from the running configuration, use the no form of this command.
vpnclient ipsec-over-tcp [port tcp_port]
no vpnclient ipsec-over-tcp
Syntax Description
port
(Optional) Specifies the use of a particular port.
tcp_port
(Required if you specify the keyword port.) Specifies the TCP port number to be used for a TCP-encapsulated IPSec tunnel.
Defaults
The Easy VPN Remote connection uses port 10000 if the command does not specify a port number.
Command Modes
The following table shows the modes in which you can enter the command:
Global configuration
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•
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Command History
Usage Guidelines
This command applies only to the ASA 5505 running as an Easy VPN hardware client (also called "Easy VPN Remote").
By default, the Easy VPN client and server encapsulate IPSec in User Datagram Protocol (UDP) packets. Some environments, such as those with certain firewall rules, or NAT and PAT devices, prohibit UDP. To use standard Encapsulating Security Protocol (ESP, Protocol 50) or Internet Key Exchange (IKE, UDP 500) in such environments, you must configure the client and the server to encapsulate IPSec within TCP packets to enable secure tunneling. If your environment allows UDP, however, configuring IPSec over TCP adds unnecessary overhead.
If you configure an ASA 5505 to use TCP-encapsulated IPSec, enter the following command to let it send large packets over the outside interface:
hostname(config)# crypto ipsec df-bit clear-df outsidehostname(config)#This command clears the Don't Fragment (DF) bit from the encapsulated header. A DF bit is a bit within the IP header that determines whether the packet can be fragmented. This command lets the Easy VPN hardware client send packets that are larger than the MTU size.
Examples
The following example shows how to configure the Easy VPN hardware client to use TCP-encapsulated IPSec, using the default port 10000, and to let it send large packets over the outside interface:
hostname(config)# vpnclient ipsec-over-tcphostname(config)# crypto ipsec df-bit clear-df outside
