Cisco Wireless ISR and HWIC Access Point Configuration Guide
Configuring RADIUS
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Configuring RADIUS Servers

Table Of Contents

Configuring RADIUS Servers

Configuring and Enabling RADIUS

Understanding RADIUS

RADIUS Operation

Configuring RADIUS

Default RADIUS Configuration

Identifying the RADIUS Server Host

Configuring RADIUS Login Authentication

Defining AAA Server Groups

Configuring RADIUS Authorization for User Privileged Access and Network Services

Starting RADIUS Accounting

Selecting the CSID Format

Configuring Settings for All RADIUS Servers

Configuring the Access Point to Use Vendor-Specific RADIUS Attributes

Configuring the Access Point for Vendor-Proprietary RADIUS Server Communication

Configuring WISPr RADIUS Attributes

Displaying the RADIUS Configuration

RADIUS Attributes Sent by the Access Point


Configuring RADIUS Servers


This chapter describes how to enable and configure the Remote Authentication Dial-In User Service (RADIUS), that provides detailed accounting information and flexible administrative control over authentication and authorization processes. RADIUS is facilitated through AAA and can be enabled only through AAA commands.


Note You can configure your access point as a local authenticator to provide a backup for your main server or to provide authentication service on a network without a RADIUS server. See Chapter 6, "Configuring Authentication Types," for detailed instructions on configuring your access point as a local authenticator.



Note For complete syntax and usage information for the commands used in this chapter, refer to the Cisco IOS Security Command Reference for Release 12.2.


Configuring and Enabling RADIUS

This section describes how to configure and enable RADIUS. These sections describe RADIUS configuration:

Understanding RADIUS

RADIUS Operation

Configuring RADIUS

Displaying the RADIUS Configuration

RADIUS Attributes Sent by the Access Point

Understanding RADIUS

RADIUS is a distributed client/server system that secures networks against unauthorized access. RADIUS clients run on supported Cisco devices and send authentication requests to a central RADIUS server, which contains all user authentication and network service access information. The RADIUS host is normally a multiuser system running RADIUS server software from Cisco (Cisco Secure Access Control Server version 3.0), Livingston, Merit, Microsoft, or another software provider. For more information, refer to the RADIUS server documentation.

Use RADIUS in these network environments, which require access security:

Networks with multiple-vendor access servers, each supporting RADIUS. For example, access servers from several vendors use a single RADIUS server-based security database. In an IP-based network with multiple vendors' access servers, dial-in users are authenticated through a RADIUS server that is customized to work with the Kerberos security system.

Turnkey network security environments in which applications support the RADIUS protocol, such as an access environment that uses a smart card access control system. In one case, RADIUS has been used with Enigma's security cards to validate users and to grant access to network resources.

Networks already using RADIUS. You can add a Cisco access point containing a RADIUS client to the network.

Networks that require resource accounting. You can use RADIUS accounting independently of RADIUS authentication or authorization. The RADIUS accounting functions allow data to be sent at the start and end of services, showing the amount of resources (such as time, packets, bytes, and so forth) used during the session. An Internet service provider might use a freeware-based version of RADIUS access control and accounting software to meet special security and billing needs.

RADIUS is not suitable in these network security situations:

Multiprotocol access environments. RADIUS does not support AppleTalk Remote Access (ARA), NetBIOS Frame Control Protocol (NBFCP), NetWare Asynchronous Services Interface (NASI), or X.25 PAD connections.

Switch-to-switch or router-to-router situations. RADIUS does not provide two-way authentication. RADIUS can be used to authenticate from one device to a non-Cisco device if the non-Cisco device requires authentication.

Networks using a variety of services. RADIUS generally binds a user to one service model.

RADIUS Operation

When a wireless user attempts to log in and authenticate to an access point whose access is controlled by a RADIUS server, authentication to the network occurs in the steps shown in Figure 7-1:

Figure 7-1 Sequence for EAP Authentication

In Steps 1 through 9 in Figure 7-1, a wireless client device and a RADIUS server on the wired LAN use 802.1x and EAP to perform a mutual authentication through the access point. The RADIUS server sends an authentication challenge to the client. The client uses a one-way encryption of the user-supplied password to generate a response to the challenge and sends that response to the RADIUS server. Using information from its user database, the RADIUS server creates its own response and compares that to the response from the client. When the RADIUS server authenticates the client, the process repeats in reverse, and the client authenticates the RADIUS server.

When mutual authentication is complete, the RADIUS server and the client determine a WEP key that is unique to the client and provides the client with the appropriate level of network access, thereby approximating the level of security in a wired switched segment to an individual desktop. The client loads this key and prepares to use it for the logon session.

During the logon session, the RADIUS server encrypts and sends the WEP key, called a session key, over the wired LAN to the access point. The access point encrypts its broadcast key with the session key and sends the encrypted broadcast key to the client, which uses the session key to decrypt it. The client and access point activate WEP and use the session and broadcast WEP keys for all communications during the remainder of the session.

There is more than one type of EAP authentication, but the access point behaves the same way for each type: it relays authentication messages from the wireless client device to the RADIUS server and from the RADIUS server to the wireless client device. See the "Assigning Authentication Types to an SSID" section on page 6-9 for instructions on setting up client authentication using a RADIUS server.

Configuring RADIUS

This section describes how to configure your access point to support RADIUS. At a minimum, you must identify the host or hosts that run the RADIUS server software and define the method lists for RADIUS authentication. You can optionally define method lists for RADIUS authorization and accounting.

A method list defines the sequence and methods to be used to authenticate, to authorize, or to keep accounts on a user. You can use method lists to designate one or more security protocols to be used, thus ensuring a backup system if the initial method fails. The software uses the first method listed to authenticate, to authorize, or to keep accounts on users; if that method does not respond, the software selects the next method in the list. This process continues until there is successful communication with a listed method or the method list is exhausted.

You should have access to and should configure a RADIUS server before configuring RADIUS features on your access point.

This section contains this configuration information:

Default RADIUS Configuration

Identifying the RADIUS Server Host (required)

Configuring RADIUS Login Authentication (required)

Defining AAA Server Groups (optional)

Configuring RADIUS Authorization for User Privileged Access and Network Services (optional)

Starting RADIUS Accounting (optional)

Selecting the CSID Format (optional)

Configuring Settings for All RADIUS Servers (optional)

Configuring the Access Point to Use Vendor-Specific RADIUS Attributes (optional)

Configuring the Access Point for Vendor-Proprietary RADIUS Server Communication (optional)

Configuring WISPr RADIUS Attributes (optional)


Note The RADIUS server CLI commands are disabled until you enter the aaa new-model command.


Default RADIUS Configuration

RADIUS and AAA are disabled by default.

To prevent a lapse in security, you cannot configure RADIUS through a network management application. When enabled, RADIUS can authenticate users accessing the access point through the CLI.

Identifying the RADIUS Server Host

Access point-to-RADIUS-server communication involves several components:

Host name or IP address

Authentication destination port

Accounting destination port

Key string

Timeout period

Retransmission value

You identify RADIUS security servers by their host name or IP address, host name and specific UDP port numbers, or their IP address and specific UDP port numbers. The combination of the IP address and the UDP port number creates a unique identifier allowing different ports to be individually defined as RADIUS hosts providing a specific AAA service. This unique identifier enables RADIUS requests to be sent to multiple UDP ports on a server at the same IP address.

If two different host entries on the same RADIUS server are configured for the same service—such as accounting—the second host entry configured acts as a fail-over backup to the first one. Using this example, if the first host entry fails to provide accounting services, the access point tries the second host entry configured on the same device for accounting services. (The RADIUS host entries are tried in the order that they are configured.)

A RADIUS server and the access point use a shared secret text string to encrypt passwords and exchange responses. To configure RADIUS to use the AAA security commands, you must specify the host running the RADIUS server daemon and a secret text (key) string that it shares with the access point.

The timeout, retransmission, and encryption key values can be configured globally per server for all RADIUS servers or in some combination of global and per-server settings. To apply these settings globally to all RADIUS servers communicating with the access point, use the three unique global configuration commands: radius-server timeout, radius-server retransmit, and radius-server key. To apply these values on a specific RADIUS server, use the radius-server host global configuration command.


Note If you configure both global and per-server functions (timeout, retransmission, and key commands) on the access point, the per-server timer, retransmission, and key value commands override global timer, retransmission, and key value commands. For information on configuring these setting on all RADIUS servers, see the "Configuring Settings for All RADIUS Servers" section.


You can configure the access point to use AAA server groups to group existing server hosts for authentication. For more information, see the "Defining AAA Server Groups" section.

Beginning in privileged EXEC mode, follow these steps to configure per-server RADIUS server communication. This procedure is required.

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

aaa new-model

Enable AAA.

Step 3 

radius-server host {hostname | ip-address} [auth-port port-number] [acct-port port-number] [timeout seconds] [retransmit retries] [key string]

Specify the IP address or host name of the remote RADIUS server host.

(Optional) For auth-port port-number, specify the UDP destination port for authentication requests.(Optional) For acct-port port-number, specify the UDP destination port for accounting requests.

(Optional) For timeout seconds, specify the time interval that the access point waits for the RADIUS server to reply before retransmitting. The range is 1 to 1000. This setting overrides the radius-server timeout global configuration command setting. If no timeout is set with the radius-server host command, the setting of the radius-server timeout command is used.

(Optional) For retransmit retries, specify the number of times a RADIUS request is resent to a server if that server is not responding or responding slowly. The range is 1 to 1000. If no retransmit value is set with the radius-server host command, the setting of the radius-server retransmit global configuration command is used.

(Optional) For key string, specify the authentication and encryption key used between the access point and the RADIUS daemon running on the RADIUS server.

Note The key is a text string that must match the encryption key used on the RADIUS server. Always configure the key as the last item in the radius-server host command. Leading spaces are ignored, but spaces within and at the end of the key are used. If you use spaces in your key, do not enclose the key in quotation marks unless the quotation marks are part of the key.

To configure the access point to recognize more than one host entry associated with a single IP address, enter this command as many times as necessary, making sure that each UDP port number is different. The access point software searches for hosts in the order in which you specify them. Set the timeout, retransmit, and encryption key values to use with the specific RADIUS host.

Step 4 

dot11 ssid ssid-string

Enter SSID configuration mode for an SSID on which you need to enable accounting. The SSID can consist of up to 32 alphanumeric characters. SSIDs are case sensitive.

Step 5 

accounting list-name

Enable RADIUS accounting for this SSID. For list-name, specify the accounting method list. Click this URL for more information on method lists: http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fsecur_c/fsaaa/scfacct.htm#xtocid2

Note To enable accounting for an SSID, you must include the accounting command in the SSID configuration. Click this URL to browse to a detailed description of the SSID configuration mode accounting command:

http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_command_reference_chapter09186a008041757f.html#wp2449819

Step 6 

end

Return to privileged EXEC mode.

Step 7 

show running-config

Verify your entries.

Step 8 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To remove the specified RADIUS server, use the no radius-server host hostname | ip-address global configuration command.

This example shows how to configure one RADIUS server to be used for authentication and another to be used for accounting:

router(config)# radius-server host 172.29.36.49 auth-port 1612 key rad1
router(config)# radius-server host 172.20.36.50 acct-port 1618 key rad2

This example shows how to configure an SSID for RADIUS accounting:

router(config)# dot11 ssid batman
router(config-ssid)# accounting accounting-method-list

This example shows how to configure host1 as the RADIUS server and to use the default ports for both authentication and accounting:

router(config)# radius-server host host1


Note You also need to configure some settings on the RADIUS server. These settings include the IP address of the access point and the key string to be shared by both the server and the access point. For more information, refer to the RADIUS server documentation.


Configuring RADIUS Login Authentication

To configure AAA authentication, you define a named list of authentication methods and then apply that list to various interfaces. The method list defines the types of authentication to be performed and the sequence in which they are performed; it must be applied to a specific interface before any of the defined authentication methods are performed. The only exception is the default method list (which, by coincidence, is named default). The default method list is automatically applied to all interfaces except those that have a named method list explicitly defined.

A method list describes the sequence and authentication methods to be queried to authenticate a user. You can designate one or more security protocols to be used for authentication, thus ensuring a backup system for authentication in case the initial method fails. The software uses the first method listed to authenticate users; if that method fails to respond, the software selects the next authentication method in the method list. This process continues until there is successful communication with a listed authentication method or until all defined methods are exhausted. If authentication fails at any point in this cycle—meaning that the security server or local username database responds by denying the user access—the authentication process stops, and no other authentication methods are attempted.

Beginning in privileged EXEC mode, follow these steps to configure login authentication. This procedure is required.

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

aaa new-model

Enable AAA.

Step 3 

aaa authentication login {default | list-name} method1 [method2...]

Create a login authentication method list.

To create a default list that is used when a named list is not specified in the login authentication command, use the default keyword followed by the methods that are to be used in default situations. The default method list is automatically applied to all interfaces. For more information on list names, click this link: http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fsecur_c/fsaaa/scfathen.htm#xtocid2

For method1..., specify the actual method the authentication algorithm tries. The additional methods of authentication are used only if the previous method returns an error, not if it fails.

Select one of these methods:

line—Use the line password for authentication. You must define a line password before you can use this authentication method. Use the password password line configuration command.

local—Use the local username database for authentication. You must enter username information in the database. Use the username password global configuration command.

radius—Use RADIUS authentication. You must configure the RADIUS server before you can use this authentication method. For more information, see the "Identifying the RADIUS Server Host" section.

Step 4 

line [console | tty | vty] line-number [ending-line-number]

Enter line configuration mode, and configure the lines to which you want to apply the authentication list.

Step 5 

login authentication {default | list-name}

Apply the authentication list to a line or set of lines.

If you specify default, use the default list created with the aaa authentication login command.

For list-name, specify the list created with the aaa authentication login command.

Step 6 

radius-server attribute 32 include-in-access-req format %h

Configure the access point to send its system name in the NAS_ID attribute for authentication.

Step 7 

end

Return to privileged EXEC mode.

Step 8 

show running-config

Verify your entries.

Step 9 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable AAA, use the no aaa new-model global configuration command. To disable AAA authentication, use the no aaa authentication login {default | list-name} method1 [method2...] global configuration command. To either disable RADIUS authentication for logins or to return to the default value, use the no login authentication {default | list-name} line configuration command.

Defining AAA Server Groups

You can configure the access point to use AAA server groups to group existing server hosts for authentication. You select a subset of the configured server hosts and use them for a particular service. The server group is used with a global server-host list, which lists the IP addresses of the selected server hosts.

Server groups also can include multiple host entries for the same server if each entry has a unique identifier (the combination of the IP address and UDP port number), allowing different ports to be individually defined as RADIUS hosts providing a specific AAA service. If you configure two different host entries on the same RADIUS server for the same service (such as accounting), the second configured host entry acts as a fail-over backup to the first one.

You use the server group server configuration command to associate a particular server with a defined group server. You can either identify the server by its IP address or identify multiple host instances or entries by using the optional auth-port and acct-port keywords.

Beginning in privileged EXEC mode, follow these steps to define the AAA server group and associate a particular RADIUS server with it:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

aaa new-model

Enable AAA.

Step 3 

radius-server host {hostname | ip-address} [auth-port port-number] [acct-port port-number] [timeout seconds] [retransmit retries] [key string]

Specify the IP address or host name of the remote RADIUS server host.

(Optional) For auth-port port-number, specify the UDP destination port for authentication requests.

(Optional) For acct-port port-number, specify the UDP destination port for accounting requests.

(Optional) For timeout seconds, specify the time interval that the access point waits for the RADIUS server to reply before retransmitting. The range is 1 to 1000. This setting overrides the radius-server timeout global configuration command setting. If no timeout is set with the radius-server host command, the setting of the radius-server timeout command is used.

(Optional) For retransmit retries, specify the number of times a RADIUS request is resent to a server if that server is not responding or responding slowly. The range is 1 to 1000. If no retransmit value is set with the radius-server host command, the setting of the radius-server retransmit global configuration command is used.

(Optional) For key string, specify the authentication and encryption key used between the access point and the RADIUS daemon running on the RADIUS server.

Note The key is a text string that must match the encryption key used on the RADIUS server. Always configure the key as the last item in the radius-server host command. Leading spaces are ignored, but spaces within and at the end of the key are used. If you use spaces in your key, do not enclose the key in quotation marks unless the quotation marks are part of the key.

To configure the access point to recognize more than one host entry associated with a single IP address, enter this command as many times as necessary, making sure that each UDP port number is different. The access point software searches for hosts in the order in which you specify them. Set the timeout, retransmit, and encryption key values to use with the specific RADIUS host.

Step 4 

aaa group server radius group-name

Define the AAA server-group with a group name.

This command puts the access point in a server group configuration mode.

Step 5 

server ip-address

Associate a particular RADIUS server with the defined server group. Repeat this step for each RADIUS server in the AAA server group.

Each server in the group must be previously defined in Step 2.

Step 6 

end

Return to privileged EXEC mode.

Step 7 

show running-config

Verify your entries.

Step 8 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

Step 9 

 

Enable RADIUS login authentication. See the "Configuring RADIUS Login Authentication" section.

To remove the specified RADIUS server, use the no radius-server host hostname | ip-address global configuration command. To remove a server group from the configuration list, use the no aaa group server radius group-name global configuration command. To remove the IP address of a RADIUS server, use the no server ip-address server group configuration command.

In this example, the access point is configured to recognize two different RADIUS group servers (group1 and group2). Group1 has two different host entries on the same RADIUS server configured for the same services. The second host entry acts as a fail-over backup to the first entry.

router(config)# aaa new-model
router(config)# radius-server host 172.20.0.1 auth-port 1000 acct-port 1001
router(config)# radius-server host 172.10.0.1 auth-port 1645 acct-port 1646
router(config)# aaa group server radius group1
router(config-sg-radius)# server 172.20.0.1 auth-port 1000 acct-port 1001
router(config-sg-radius)# exit
router(config)# aaa group server radius group2
router(config-sg-radius)# server 172.20.0.1 auth-port 2000 acct-port 2001
router(config-sg-radius)# exit

Configuring RADIUS Authorization for User Privileged Access and Network Services

AAA authorization limits the services available to a user. When AAA authorization is enabled, the access point uses information retrieved from the user's profile, which is in the local user database or on the security server, to configure the user's session. The user is granted access to a requested service only if the information in the user profile allows it.


Note This section describes setting up authorization for access point administrators, not for wireless client devices.


You can use the aaa authorization global configuration command with the radius keyword to set parameters that restrict a user's network access to privileged EXEC mode.

The aaa authorization exec radius local command sets these authorization parameters:

Use RADIUS for privileged EXEC access authorization if authentication was performed by using RADIUS.

Use the local database if authentication was not performed by using RADIUS.


Note Authorization is bypassed for authenticated users who log in through the CLI even if authorization has been configured.


Beginning in privileged EXEC mode, follow these steps to specify RADIUS authorization for privileged EXEC access and network services:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

aaa authorization network radius

Configure the access point for user RADIUS authorization for all network-related service requests.

Step 3 

aaa authorization exec radius

Configure the access point for user RADIUS authorization to determine if the user has privileged EXEC access.

The exec keyword might return user profile information (such as autocommand information).

Step 4 

end

Return to privileged EXEC mode.

Step 5 

show running-config

Verify your entries.

Step 6 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable authorization, use the no aaa authorization {network | exec} method1 global configuration command.

Starting RADIUS Accounting

The AAA accounting feature tracks the services that users are accessing and the amount of network resources that they are consuming. When AAA accounting is enabled, the access point reports user activity to the RADIUS security server in the form of accounting records. Each accounting record contains accounting attribute-value (AV) pairs and is stored on the security server. This data can then be analyzed for network management, client billing, or auditing. See the "RADIUS Attributes Sent by the Access Point" section for a complete list of attributes sent and honored by the access point.

Beginning in privileged EXEC mode, follow these steps to enable RADIUS accounting for each Cisco IOS privilege level and for network services:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

aaa accounting network start-stop radius

Enable RADIUS accounting for all network-related service requests.

Step 3 

ip radius source-interface bvi1

Configure the access point to send its BVI IP address in the NAS_IP_ADDRESS attribute for accounting records.

Step 4 

aaa accounting update periodic minutes

Enter an accounting update interval in minutes.

Step 5 

end

Return to privileged EXEC mode.

Step 6 

show running-config

Verify your entries.

Step 7 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable accounting, use the no aaa accounting {network | exec} {start-stop} method1... global configuration command.

Selecting the CSID Format

You can select the format for MAC addresses in Called-Station-ID (CSID) and Calling-Station-ID attributes in RADIUS packets. Use the dot11 aaa csid global configuration command to select the CSID format. Table 7-1 lists the format options with corresponding MAC address examples.

Table 7-1 CSID Format Options

Option
MAC Address Example

default

0007.85b3.5f4a

ietf

00-07-85-b3-5f-4a

unformatted

000785b35f4a


To return to the default CSID format, use the no form of the dot11 aaa csid command, or enter
dot11 aaa csid default.


Note You can also use the aaa csid command to select the CSID format.


Configuring Settings for All RADIUS Servers

Beginning in privileged EXEC mode, follow these steps to configure global communication settings between the access point and all RADIUS servers:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

radius-server key string

Specify the shared secret text string used between the access point and all RADIUS servers.

Note The key is a text string that must match the encryption key used on the RADIUS server. Leading spaces are ignored, but spaces within and at the end of the key are used. If you use spaces in your key, do not enclose the key in quotation marks unless the quotation marks are part of the key.

Step 3 

radius-server retransmit retries

Specify the number of times the access point sends each RADIUS request to the server before giving up. The default is 3; the range 1 to 1000.

Step 4 

radius-server timeout seconds

Specify the number of seconds an access point waits for a reply to a RADIUS request before resending the request. The default is 5 seconds; the range is 1 to 1000.

Step 5 

radius-server deadtime minutes

Use this command to cause the Cisco IOS software to mark as "dead" any RADIUS servers that fail to respond to authentication requests, thus avoiding the wait for the request to time out before trying the next configured server. A RADIUS server marked as dead is skipped by additional requests for the duration of minutes that you specify, up to a maximum of 1440 (24 hours).

Note If you set up more than one RADIUS server, you must configure the RADIUS server deadtime for optimal performance.

Step 6 

radius-server attribute 32 include-in-access-req format %h

Configure the access point to send its system name in the NAS_ID attribute for authentication.

Step 7 

end

Return to privileged EXEC mode.

Step 8 

show running-config

Verify your settings.

Step 9 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To return to the default setting for retransmit, timeout, and deadtime, use the no forms of these commands.

Configuring the Access Point to Use Vendor-Specific RADIUS Attributes

The Internet Engineering Task Force (IETF) draft standard specifies a method for communicating vendor-specific information between the access point and the RADIUS server by using the vendor-specific attribute (attribute 26). Vendor-specific attributes (VSAs) allow vendors to support their own extended attributes not suitable for general use. The Cisco RADIUS implementation supports one vendor-specific option by using the format recommended in the specification. Cisco's vendor ID is 9, and the supported option has vendor type 1, which is named cisco-avpair. The value is a string with this format:

protocol : attribute sep value *

Protocol is a value of the Cisco protocol attribute for a particular type of authorization. Attribute and value are an appropriate AV pair defined in the Cisco TACACS+ specification, and sep is = for mandatory attributes and the asterisk (*) for optional attributes. This allows the full set of features available for TACACS+ authorization to also be used for RADIUS.

For example, the following AV pair activates Cisco's multiple named ip address pools feature during IP authorization (during PPP's IPCP address assignment):

cisco-avpair= "ip:addr-pool=first"

The following example shows how to provide a user logging in from an access point with immediate access to privileged EXEC commands:

cisco-avpair= "shell:priv-lvl=15" 

Other vendors have their own unique vendor IDs, options, and associated VSAs. For more information about vendor IDs and VSAs, refer to RFC 2138, "Remote Authentication Dial-In User Service (RADIUS)."

Beginning in privileged EXEC mode, follow these steps to configure the access point to recognize and use VSAs:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

radius-server vsa send [accounting | authentication]

Enable the access point to recognize and use VSAs as defined by RADIUS IETF attribute 26.

(Optional) Use the accounting keyword to limit the set of recognized vendor-specific attributes to only accounting attributes.

(Optional) Use the authentication keyword to limit the set of recognized vendor-specific attributes to only authentication attributes.

If you enter this command without keywords, both accounting and authentication vendor-specific attributes are used.

Step 3 

end

Return to privileged EXEC mode.

Step 4 

show running-config

Verify your settings.

Step 5 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

For a complete list of RADIUS attributes or more information about VSA 26, refer to the "RADIUS Attributes" appendix in the Cisco IOS Security Configuration Guide for Release 12.2.

Configuring the Access Point for Vendor-Proprietary RADIUS Server Communication

Although an IETF draft standard for RADIUS specifies a method for communicating vendor-proprietary information between the access point and the RADIUS server, some vendors have extended the RADIUS attribute set in a unique way. Cisco IOS software supports a subset of vendor-proprietary RADIUS attributes.

As mentioned earlier, to configure RADIUS (whether vendor-proprietary or IETF draft-compliant), you must specify the host running the RADIUS server daemon and the secret text string it shares with the access point. You specify the RADIUS host and secret text string by using the radius-server global configuration commands.

Beginning in privileged EXEC mode, follow these steps to specify a vendor-proprietary RADIUS server host and a shared secret text string:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

radius-server host {hostname | ip-address} non-standard

Specify the IP address or host name of the remote RADIUS server host and identify that it is using a vendor-proprietary implementation of RADIUS.

Step 3 

radius-server key string

Specify the shared secret text string used between the access point and the vendor-proprietary RADIUS server. The access point and the RADIUS server use this text string to encrypt passwords and exchange responses.

Note The key is a text string that must match the encryption key used on the RADIUS server. Leading spaces are ignored, but spaces within and at the end of the key are used. If you use spaces in your key, do not enclose the key in quotation marks unless the quotation marks are part of the key.

Step 4 

end

Return to privileged EXEC mode.

Step 5 

show running-config

Verify your settings.

Step 6 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To delete the vendor-proprietary RADIUS host, use the no radius-server host {hostname | ip-address} non-standard global configuration command. To disable the key, use the no radius-server key global configuration command.

This example shows how to specify a vendor-proprietary RADIUS host and to use a secret key of rad124 between the access point and the server:

router(config)# radius-server host 172.20.30.15 nonstandard
router(config)# radius-server key rad124

Configuring WISPr RADIUS Attributes

The Wi-Fi Alliance's WISPr Best Current Practices for Wireless Internet Service Provider (WISP) Roaming document lists RADIUS attributes that access points must send with RADIUS accounting and authentication requests. The access point currently supports only the WISPr location-name and the ISO and International Telecommunications Union (ITU) country and area codes attributes. Use the snmp-server location and the dot11 location isocc commands to configure these attributes on the access point.

The WISPr Best Current Practices for Wireless Internet Service Provider (WISP) Roaming document also requires the access point to include a class attribute in RADIUS authentication replies and accounting requests. The access point includes the class attribute automatically and does not have to be configured to do so.

You can find a list of ISO and ITU country and area codes at the ISO and ITU websites. Cisco IOS software does not check the validity of the country and area codes that you configure on the access point.

Beginning in privileged EXEC mode, follow these steps to specify WISPr RADIUS attributes on the access point:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

snmp-server location location

Specify the WISPr location-name attribute. The WISPr Best Current Practices for Wireless Internet Service Provider (WISP) Roaming document recommends that you enter the location name in this format:

hotspot_operator_name,location

Step 3 

dot11 location isocc ISO-country-code cc country-code ac area-code

Specify ISO and ITU country and area codes that the access point includes in accounting and authentication requests.

isocc ISO-country-code—specifies the ISO country code that the access point includes in RADIUS authentication and accounting requests

cc country-code—specifies the ITU country code that the access point includes in RADIUS authentication and accounting requests

ac area-code—specifies the ITU area code that the access point includes in RADIUS authentication and accounting requests

Step 4 

end

Return to privileged EXEC mode.

Step 5 

show running-config

Verify your settings.

Step 6 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

This example shows how to configure the WISPr location-name attribute:

router# snmp-server location ACMEWISP,Gate_14_Terminal_C_of_Newark_Airport

This example shows how to configure the ISO and ITU location codes on the access point:

router# dot11 location isocc us cc 1 ac 408

This example shows how the access point adds the SSID used by the client device and formats the location-ID string:

isocc=us,cc=1,ac=408,network=ACMEWISP_NewarkAirport

Displaying the RADIUS Configuration

To display the RADIUS configuration, use the show running-config privileged EXEC command.


Note When DNS is configured on the access point, the show running-config command sometimes displays a server's IP address instead of its name.


RADIUS Attributes Sent by the Access Point

Table 7-2 through Table 7-6 identify the attributes sent by an access point to a client in access-request, access-accept, and accounting-request packets.


Note You can configure the access point to include in its RADIUS accounting and authentication requests attributes recommended by the Wi-Fi Alliance's WISPr Best Current Practices for Wireless Internet Service Provider (WISP) Roaming document. Refer to the "Configuring WISPr RADIUS Attributes" section for instructions.


Table 7-2 Attributes Sent in Access-Request Packets

Attribute ID
Description

1

User-Name

4

NAS-IP-Address

5

NAS-Port

12

Framed-MTU

30

Called-Station-ID (MAC address)

31

Calling-Station-ID (MAC address)

32

NAS-Identifier1

61

NAS-Port-Type

79

EAP-Message

80

Message-Authenticator

1 The access point sends the NAS-Identifier if attribute 32 (include-in-access-req) is configured.


Table 7-3 Attributes Honored in Access-Accept Packets

Attribute ID
Description

25

Class

27

Session-Timeout

64

Tunnel-Type1

65

Tunnel-Medium-Type1

79

EAP-Message

80

Message-Authenticator

81

Tunnel-Private-Group-ID1

VSA (attribute 26)

LEAP session-key

VSA (attribute 26)

Auth-Algo-Type

VSA (attribute 26)

SSID

1 RFC2868; defines a VLAN override number.


Table 7-4 Attributes Sent in Accounting-Request (start) Packets

Attribute ID
Description

1

User-Name

4

NAS-IP-Address

5

NAS-Port

6

Service-Type

25

Class

41

Acct-Delay-Time

44

Acct-Session-Id

61

NAS-Port-Type

VSA (attribute 26)

SSID

VSA (attribute 26)

NAS-Location

VSA (attribute 26)

Cisco-NAS-Port

VSA (attribute 26)

Interface


Table 7-5 Attributes Sent in Accounting-Request (update) Packets 

Attribute ID
Description

1

User-Name

4

NAS-IP-Address

5

NAS-Port

6

Service-Type

25

Class

41

Acct-Delay-Time

42

Acct-Input-Octets

43

Acct-Output-Octets

44

Acct-Session-Id

46

Acct-Session-Time

47

Acct-Input-Packets

48

Acct-Output-Packets

61

NAS-Port-Type

VSA (attribute 26)

SSID

VSA (attribute 26)

NAS-Location

VSA (attribute 26)

VLAN-ID

VSA (attribute 26)

Connect-Progress

VSA (attribute 26)

Cisco-NAS-Port

VSA (attribute 26)

Interface


Table 7-6 Attributes Sent in Accounting-Request (stop) Packets 

Attribute ID
Description

1

User-Name

4

NAS-IP-Address

5

NAS-Port

6

Service-Type

25

Class

41

Acct-Delay-Time

42

Acct-Input-Octets

43

Acct-Output-Octets

44

Acct-Session-Id

46

Acct-Session-Time

47

Acct-Input-Packets

48

Acct-Output-Packets

49

Acct-Terminate-Cause

61

NAS-Port-Type

VSA (attribute 26)

SSID

VSA (attribute 26)

NAS-Location

VSA (attribute 26)

Disc-Cause-Ext

VSA (attribute 26)

VLAN-ID

VSA (attribute 26)

Connect-Progress

VSA (attribute 26)

Cisco-NAS-Port

VSA (attribute 26)

Interface

VSA (attribute 26)

Auth-Algo-Type



Note By default, the access point sends reauthentication requests to the authentication server with the service-type attribute set to authenticate-only. However, some Microsoft IAS servers do not support the authenticate-only service-type attribute. Changing the service-type attribute to login-only ensures that Microsoft IAS servers recognize reauthentication requests from the access point. Use the dot11 aaa authentication attributes service-type login-only global configuration command to set the service-type attribute in reauthentication requests to login-only.