Table Of Contents
Release Notes for the Cisco PIX Firewall Version 5.2(1)
Cisco IOS Software Interoperability
Cisco Secure Policy Manager Interoperability
Cisco Secure VPN Client Interoperability
Cisco VPN 3000 Concentrator Manager and Client Interoperability
PIX Firewall Manager Interoperability
Determining the Software Version
Upgrading to a New Software Release
New Hardware Features in Release 5.2(1)
Inside and Outside Port Restriction Change
New Software Features in Release 5.2(1)
Certification Authority Servers—Baltimore and Microsoft
Cisco VPN 3000 Client (Formerly the Altiga VPN Client)
Deny Xlate for Network or Broadcast Address for Inbound Traffic
DHCP Server and Client Support
IP Fragmentation Syslog Messages
Unicast Reverse Path Forwarding
Websense Filtering by Username and Group
New Commands in Version 5.2(1)
New Command Options in Version 5.2(1)
Command Changes in Version 5.2(1)
New Messages in Version 5.2(1)
Removed Messages in Version 5.2(1)
Cisco VPN 3000 Concentrator Manager
Token-based Authentication for VPN Clients
Resolved Caveats - Release 5.2(1)
Obtaining Technical Assistance
Obtaining Additional Publications and Information
Release Notes for the Cisco PIX Firewall Version 5.2(1)
September 2000
Contents
This document includes the following sections:
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Obtaining Technical Assistance
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Introduction
The Cisco PIX Firewall provides secure networking and NAT (Network Address Translation).
System Requirements
The sections that follow list the system requirements for operating a Cisco PIX Firewall unit with version 5.2(1) software.
Memory Requirements
Note
The following table lists Flash memory requirements for this release:
Software Requirements
The following is required for version 5.2(1):
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To obtain a DES (56-bit) license key for the PIX Firewall, use the IPSec 56-bit Customer Registration form. Accessing this form requires prior registration on Cisco.com at http://tools.cisco.com/RPF/register/register.do. However, access to this form does not require a purchase or service contract. You can register as a guest and then proceed to fill out the form. The form is available at the following website:
http://www.cisco.com/pcgi-bin/Software/FormManager/formgenerator.pl?pid=221&fid=324
You must purchase a 3DES (168-bit) license key, or have a service contract, to obtain a 3DES license key. If you have already purchased a 3DES upgrade, and you have your Cisco PIX Firewall 3DES upgrade document with the entitlement number printed on it, you can register your license key for use on your PIX Firewall with the License Registration form. Accessing this form also requires prior registration on cisco.com at http://tools.cisco.com/RPF/register/register.do. The License Registration form is available at the following website:
https://www.cisco.com/cgi-bin/Software/FormManager/formgenerator.pl?pid=221&fid=301
You must also purchase or have a service contract to download PIX Firewall software.
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Cisco IOS Software Interoperability
If you use IKE Mode Config with the PIX Firewall, any routers on the IPSec connection must run Cisco IOS Release 12.0(6)T or later.
Cisco Secure Policy Manager Interoperability
Cisco Secure Policy Manager (Cisco Secure PM), version 2.1, provides policy-based management support for PIX Firewall units running version 4.2, 4.4, and 5.1 software images. Cisco Secure PM version 2.2 supports PIX Firewall version 5.2.
Refer to the documentation set for Cisco Secure PM at the following site:
http://www.cisco.com/en/US/partner/products/sw/secursw/ps2133/index.html
Cisco Secure VPN Client Interoperability
PIX Firewall version 5.2(1) requires Cisco Secure VPN Client version 1.1. The Cisco Secure VPN Client can be used with Windows 95, Windows 98, and Windows NT version 4.0. The Cisco Secure VPN Client is not supported for use with Windows 2000.
Cisco VPN 3000 Concentrator Manager and Client Interoperability
PIX Firewall version 5.2(1) requires Cisco VPN 3000 Client version 2.5 or later and Cisco VPN 3000 Concentrator Manager version 2.5.2 or later. The Cisco VPN 3000 Client can be used with Windows 95, Windows 98, and Windows NT version 4.0. The Cisco VPN 3000 Client is not supported for use with Windows 2000.
PIX Firewall Manager Interoperability
You can use PIX Firewall version 5.2 with the PIX Firewall Manager version 4.3(2)f. Refer to the Release Notes for the PIX Firewall Manager Version 4.3(2)f for more information. You can view this document online at the following site:
http://www.cisco.com/en/US/products/sw/secursw/ps2120/prod_release_note09186a008008c1d1.html
The PIX Firewall Manager (PFM) lets you manage PIX Firewall units; however, it does not let you configure any PIX Firewall features added after version 4.3(2).
The "Frequently Asked Questions" section in the PFM release notes provides useful troubleshooting information.
Determining the Software Version
Use the show version command to verify the software version of your PIX Firewall unit.
Upgrading to a New Software Release
If you have a cisco.com login, you can obtain software from the following site:
http://www.cisco.com/pcgi-bin/tablebuild.pl/pix
To register for a cisco.com login, go to the following site:
http://tools.cisco.com/RPF/register/register.do
New and Changed Information
New Hardware Features in Release 5.2(1)
PIX 525
The new PIX 525 model has the fastest performance and highest capacity of any of the PIX Firewall series.
The PIX 525 provides the following features:
FDDI interfaces are not supported for use on the PIX 525 in version 5.2(1).
Failover Serial Connection
The failover serial connection has been increased from 9600 baud to 117,760 baud (115K). The maximum supported length for the failover serial cable is 6 feet.
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Inside and Outside Port Restriction Change
With the 5.2 software release, there are no longer restrictions on having to use specific Ethernet ports as the inside and outside network ports. Any port, whether fixed or a PCI expansion port, and any interface type, FDDI, Token Ring, Fast Ethernet, or Gigabit Ethernet, can be assigned to be the inside or outside network port.
Use the following notes, restrictions, and instructions for configuring inside and outside network ports:
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clear|no|show nameif hardware_if if_name security_levelThe following is an example of the default interface name information using the show nameif command:
nameif ethernet0 outside security0nameif ethernet1 inside security100nameif ethernet2 pix/intf2 security10nameif ethernet3 pix/intf3 security15nameif token-ring0 pix/intf4 security20nameif gb-ethernet0 pix/intf5 security25New Software Features in Release 5.2(1)
The following features are new in version 5.2(1). Refer to the Cisco PIX Firewall Configuration Guide, Version 5.2 for information about each software feature. IPSec features are described in the new Cisco PIX Firewall IPSec User Guide, Version 5.2.
AAA access-list Support
The new match access_list_name option was added to the aaa command.
Certification Authority Servers—Baltimore and Microsoft
In addition to supporting the Entrust and VeriSign certification authority (CA) servers, the PIX Firewall now also supports CA servers developed by Baltimore Technologies and Microsoft.
Cisco VPN 3000 Client (Formerly the Altiga VPN Client)
Remote access VPN users employing the Cisco VPN 3000 Client, version 2.5, can now securely access their private enterprise network through the PIX Firewall, version 5.2.
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Deny Xlate for Network or Broadcast Address for Inbound Traffic
For all inbound traffic, PIX Firewall now denies translations for destination IP addresses identified as network address or broadcast addresses. PIX Firewall utilizes the global IP and mask from a static command statement to differentiate regular IP addresses from network or broadcast addresses. If a global IP address is a valid network address with a matching network mask, then PIX Firewall disallows the xlate for network or broadcast IP addresses with inbound packet.
DHCP Server and Client Support
Failover Polling Time
The new failover poll seconds command lets you determine how long failover waits before sending special failover "hello" packets between the Primary and Standby units over all network interfaces and the failover cable. The default is 15 seconds. The minimum value is 3 seconds and the maximum is 15 seconds. Set to a lower value for Stateful Failover. With a faster poll time, PIX Firewall can detect failure and trigger failover faster. However, faster detection may cause unnecessary switchovers when the network is temporarily congested or a network card starts slowly.
FTP—Prevent Embedded Commands
The strict option to the fixup protocol ftp command prevents web browsers from sending embedded commands in FTP requests. Each FTP command must be acknowledged before a new command is allowed. Connections sending embedded commands are dropped. The strict option only lets an FTP server generate the 227 command and only lets an FTP client generate the PORT command. The 227 and PORT commands are checked to ensure they do not appear in an error string.
H.323 V2
H.323 is a suite of protocols defined by the International Telecommunication Union (ITU) for multimedia conferences over LANs. H.323 supports H.323 VoIP gateways and VoIP gatekeepers. H.323 version 2 adds the following functionality to the PIX Firewall:
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ICMP Access Lists
Enable or disable pinging to an interface. With pinging disabled, the PIX Firewall cannot be detected on the network. The new icmp command implements this feature. This feature is also referred to as configurable proxy pinging.
IP Fragmentation Syslog Messages
Syslog messages PIX-4-209003, PIX-4-209004, and PIX-4-209005 have been added to disclose IP fragmentation attacks.
IDS Syslog Messages
Cisco Secure Intrusion Detection System (Cisco Secure IDS) is an IP-only feature that provides some level of flexibility for the user to customize the amount of traffic that needs to be audited and logged.
PAT Enhancements
The following PAT enhancements were added:
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global [(int_name)] nat_id address | interface
The following example enables PAT using the IP address at the outside interface in global configuration mode:
ip address outside 192.150.49.1nat (inside) 1 0 0global (outside) 1 interfaceThe interface IP address used for PAT is the address associated with the interface when the xlate (translation slot) is created. This is important for configuring DHCP, allowing for the DHCP retrieved address to be used for PAT.
When PAT is enabled on an interface, there should be no loss of TCP, UDP, and ICMP services. These services allow for termination at the PIX Firewall unit's outside interface.
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Mapping Different Internal Subnets to Different PAT Addresses
The following example maps hosts on the internal network 10.1.0.0/16 to global address 192.168.1.1 and hosts on the internal network10.1.1.1/16 to global address 209.165.200.225 in global configuration mode.
nat (inside) 1 10.1.0.0 255.255.255.0nat (inside) 2 10.1.1.1 255.255.255.0global (outside) 1 192.168.1.1 netmask 255.255.255.0global (outside) 2 209.165.200.225 netmask 255.255.255.224Backing Up PAT Addresses
The following example configures two port addresses for setting up PAT on hosts from the internal network 10.1.0.0/16 in global configuration mode.
nat (inside) 1 10.1.0.0 255.255.0.0global (outside) 1 209.165.200.225 netmask 255.255.255.224global (outside) 1 192.168.1.1 netmask 255.255.255.0With this configuration, address 192.168.1.1 will only be used when the port pool from address 209.165.200.225 is at maximum capacity.
ping Command Enhancement
The PIX Firewall ping command no longer requires an interface name. If an interface name is not specified, PIX Firewall checks the routing table to find the address you specify. You can specify an interface name to indicate through which interface the ICMP echo requests are sent.
Radius Authorization
PIX Firewall now allows a RADIUS server to send user group attributes to the PIX Firewall in the RADIUS authentication response message. Authorization is granted with the access-list command statement.
SIP Support
Session initiation protocol (SIP), as defined by the Internet Engineering Task Force (IETF), enables call handling sessions—particularly two-party audio conferences, or "calls." SIP works with Session Description Protocol (SDP) for call signalling. SDP specifies the ports for the media stream. Using SIP, the PIX Firewall can support any SIP Voice over IP (VoIP) gateways and VoIP proxy servers. SIP and SDP are defined in the following RFCs:
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SSH
SSH (Secure Shell) is an application running on top of a reliable transport layer, such as TCP/IP that provides strong authentication and encryption capabilities. PIX Firewall supports the SSH remote shell functionality as provided in SSH version 1. SSH version 1 also works with Cisco IOS software devices. Up to five SSH clients are allowed simultaneous access to the PIX Firewall console.
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Obtaining an SSH Client
The following sites let you download an SSH v1.x client. Because SSH version 1.x and v2 are entirely different protocols and not compatible, be sure you download a client that supports SSH v1.x.
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http://hp.vector.co.jp/authors/VA002416/teraterm.html
A security enhancement for Tera Term Pro is available at the following site:
http://www.zip.com.au/~roca/ttssh.html
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http://www.openssh.com
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http://www.lysator.liu.se/~jonasw/freeware/niftyssh/
TCP Intercept
Prior to version 5.2, PIX Firewall offered no mechanism to protect systems reachable via a static and TCP conduit from TCP SYN segment attacks. With the new TCP intercept feature, once the optional embryonic connection limit is reached, and until the embryonic connection count falls below this threshold, every SYN segment bound for the affected server is intercepted.
This feature requires no change to the PIX Firewall command set, only that the embryonic connection limit on the static command now has a new behavior.
Unicast Reverse Path Forwarding
Due to the potential danger of IP spoofing in the IP protocol, measures need to be taken to reduce the risk of IP spoofing when possible. Unicast Reverse Path Forwarding, or reverse route lookups, prevent IP spoofing under certain circumstances. This mechanism provides ingress filtering and egress filtering.
Ingress filtering checks inbound packets for IP source address integrity. This function is limited to addresses for networks in the enforcing entities local routing table. If the incoming packet does not have a source address that is represented by a route, then it is impossible to know whether the packet arrived on the best possible path back to its origin. This is often the case because routing entities cannot maintain routes for every network.
Egress filtering verifies that packets destined for hosts outside the managed domain have IP source addresses verifiable by routes in the enforcing entities local routing table.
If an exiting packet does not arrive on the best return path back to the originator, then the packet should be dropped and the activity logged. Egress filtering prevents internal users from launching attacks using IP source addresses outside of the local domain. Because most attacks use IP spoofing to hide the identity of the attacking host, egress filtering makes the task of tracing the origin of an attack much easier. When employed, egress filtering enforces that IP source addresses are obtained from a valid pool of network addresses. Addresses local to the enforcing entity and therefore easily traceable.
Websense Filtering by Username and Group
The Websense Server (UFS) works with the PIX Firewall to deny users from access to web sites based on the company security policy.
Websense protocol version 4 enables group and username authentication between a host and a PIX Firewall. The PIX Firewall performs a username lookup, and then the Websense server handles URL filtering and username logging.
Websense protocol version 4 contains the following enhancements:
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Command Changes
All new commands, options, and changes are described in the Cisco PIX Firewall Configuration Guide Version 5.2.
New Commands in Version 5.2(1)
The following commands are new in version 5.2(1):
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New Command Options in Version 5.2(1)
The following command options are new in version 5.2(1):
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If a debug command does not use Trace Channel, each session operates independently, which means any commands started in the session only appear in the session. By default, a session not using Trace Channel has output disabled by default.
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Command Changes in Version 5.2(1)
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filter url port|except local_ip local_mask foreign_ip foreign_mask [allow]
The port option was available in past versions but did not appear in the documentation.
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%PIX-4-404101: ISAKMP: Failed to allocate address for client from pool poolname•
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isakmp key ******** address ip_addr netmask mask•
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isakmp key ******** address ip_addr netmask maskSyslog Message Changes
The sections that follow list changes to syslog messages in version 5.2. All messages are described in detail in Cisco PIX Firewall System Log Messages, Version 5.2.
New Messages in Version 5.2(1)
The following syslog messages are new in version 5.2(1):
%PIX-2-106017: Deny IP due to Land Attack from IP_addr to IP_addr%PIX-1-106021: Deny num reverse path check from IP_addr to IP_addr on interface int_name%PIX-1-106022: Deny num connection spoof from IP_addr to IP_addr on interface int_name%PIX-6-109015: Authorization denied (acl=acl_ID) for user 'username' from src_addr/src_port to dest_addr/dest_port on interface int_name%PIX-3-109016: Downloaded authorization access-list acl_ID not found for user 'username'%PIX-4-209003: Fragment database limit of num exceeded: src = IP_addr, dest = IP_addr, proto = protocol, id = id%PIX-4-209004: Invalid IP fragment, size = num exceeds maximum size = size: src = IP_addr, dest = IP_addr, proto = protocol, id = id%PIX-4-209005: Discard IP fragment set with more than num elements: src = IP_addr, dest = IP_addr, proto = protocol, id = id%PIX-3-313001: Denied ICMP type=type, code=code from IP_addr on interface int_name%PIX-6-314001: Pre-allocate RTSP UDP backconnection for faddr faddr/fport to laddr laddr/lport%PIX-3-315001: Denied SSH session from IP_addr on interface int_name%PIX-6-315002: Permitted SSH session from IP_addr on interface int_name for user "user_id"%PIX-6-315003: SSH login session failed from IP_addr on (num attempts) on interface int_name by user "user_id"%PIX-3-315004: Fail to establish SSH session because PIX RSA host key retrieval failed.%PIX-6-315011: SSH session from IP_addr on interface int_name for user "user_id" terminated normally%PIX-6-315011: SSH session from IP_addr on interface int_name for user "user_id" disconnected by SSH server, reason: "text" (status_code_in_hex)%PIX-4-4000nn: IDS:sig_num sig_msg from IP_addr to IP_addr on interface int_name%PIX-4-404101: ISAKMP: Failed to allocate address for client from pool pool_idsha%PIX-4-405101: Unable to Pre-allocate H225 Call Signalling Connection for faddr faddr[/fport] to laddr laddr[/lport]%PIX-4-405102: Unable to Pre-allocate H245 Connection for faddr faddr[/fport] to laddr laddr[/lport]%PIX-6-604101: DHCP client interface int_name: Allocated ip = IP_addr, mask = mask, gw = IP_addr%PIX-6-604102: DHCP client interface int_name: address released%PIX-6-604103: DHCP daemon interface int_name: address granted MAC_addr (IP_addr)%PIX-6-604104: DHCP daemon interface int_name: address released MAC_addr (IP_addr)Removed Messages in Version 5.2(1)
The following syslog messages were removed in version 5.2(1):
%PIX-2-106003: Connection denied src laddr dest faddr due to JAVA Applet on interface int_name.%PIX-3-201007: Unable to allocate new udp connections (faddr/fport-laddr/lport)%PIX-3-203001: ESP Error: No Key SPI hex SRC IP_addr DEST IP_addrDocumentation Changes
All IPSec configuration information is now in the Cisco PIX Firewall IPSec Usesr Guide, Version 5.2. This guide is available both online and in the PIX Firewall accessory kit.
Installation Notes
Always configure a default route command statement to the outside interface in every configuration you create. This is especially important for use with IPSec.
Limitations and Restrictions
No new limitations and restrictions were added in version 5.2(1).
Important Notes
AAA
The inbound and outbound options to the aaa command apply only to the network interfaces in the first two slots of the PIX Firewall.
CRLs
When CRL checking is configured as mandatory, PIX Firewall takes about two minutes to poll the CRL from the VeriSign CA Server during ISAKMP negotiation. As a result, ISAKMP negotiation fails with the message "ISAKMP (0): Unknown error in cert validation, 0" and packets are lost until PIX Firewall receives the CRL. [CSCdr89880]
Cisco Secure VPN Client
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The problem occurs when IKE Mode Config is configured and PIX Firewall runs out of addresses created by the ip local pool command and the next VPN Client tries to come in.
The behavior is as follows:
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This caveat does not exist for the Cisco VPN 3000 Client version 2.5. [CSCdr48442]
Cisco VPN 3000 Client
The following restrictions apply to using PIX Firewall with the Cisco VPN 3000 Client:
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For example, if you ping from the client and check the inbound and outbound SPIs, Cisco VPN 3000 Client can be seen to use the third (latest) SPI to send the ping, but PIX Firewall uses the second SPI, the one before the last, to respond to the ping. The result is that the ping responses return to the Cisco VPN 3000 Client, but are dropped. [CSCdr83223]
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Cisco VPN 3000 Concentrator Manager
The following restrictions apply to use with the Cisco VPN 3000 Concentrator Manager series:
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Failover
Refer to the "Failover" section in Chapter 3, "Advanced Configurations" in the Cisco PIX Firewall Configuration Guide, Version 5.2 for a new procedure for configuring failover.
The PIX Firewall DHCP client does not support failover configurations.
FDDI
FDDI interfaces are supported on the PIX 525 with the caveat that no other interface card can be used with FDDI cards. In addition, the Ethernet interfaces on the motherboard must be shut down using the shutdown option to the interface command.
On the PIX 520 and earlier models, when FDDI interface cards are used, no other interface card can be used on the unit.
The PIX 515 does not support use of any FDDI interface cards.
License Key Downgrade
If you downgrade your license key from a UR to an R, thereby restricting the number of supported interfaces, PIX Firewall removes all commands from your configuration that reference the unsupported interfaces. In addition, open caveat CSCdr52181 notes that PIX Firewall also removes all nat and static commands from the configuration.
SMTP
Multiple SMTP commands contained in a single packet are no longer permitted and are now dropped.
Token-based Authentication for VPN Clients
The PIX Firewall now supports token-based authentication systems through the use of the crypto map token authentication command. PIX Firewall supports the following token-based authentication systems and modes for use with the Cisco VPN 3000 Client:
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The PIX Firewall supports the SDI RADIUS token-based authentication system using Next Token mode or New Pin mode for use with the Cisco Secure VPN Client, version 1.1.
Token based authentication has not been verified for the following vendors/products:
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For more information about the crypto map token authentication command, see the crypto map command page in Chapter 12, "Command Reference" of the Cisco PIX Firewall IPSec User Guide, Version 5.2.
Caveats
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Open Caveats - Release 5.2(1)
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SSH and failover are not supported for use together in version 5.2(1). If used together, an RSA key created before failover will not appear on the Standby unit after failover occurs.
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PIX Firewall is not able to create an IPSec tunnel with a 2048 RSA key using a PIX Firewall "Classic" model.
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PIX Firewall fails to get certificates if downgraded from 5.2(1) when used with the Microsoft Certification Authority.
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When IPSec traffic is not present between a PIX Firewall to a PIX Firewall, when the IPSec and ISA lifetimes expire, both IPSec and ISA SAs are deleted. When IPSec traffic is not present between a PIX Firewall and a Cisco VPN 3000 Concentrator, when the lifetimes expire, the SAs are not deleted and the units rekey.
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H.323 call setup is not supported by failover.
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The Cisco VPN 3000 Client on Windows 95 or Windows 98 does not take the WINS server address pushed to it from the PIX Firewall if an IP address is statically configured on the client. For static configurations, users must manually configure the adapters with WINS information. This works correctly on Cisco VPN 3000 Client on Windows NT. On Windows 95 or Windows 98, dynamic WINS support works with DHCP enabled adapters; that is, PPP or NIC adapters that get their information dynamically.
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Always configure a default route command statement to the outside interface in every configuration you create. This is especially important for use with IPSec.
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ICMP types 3, 4, 5, 11, 12, 13, 14, 15, 16, 17, and 18 fail with PAT.
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During the PIX Firewall unit's enrollment request to a Baltimore CA server, the process fails. This failure occurs when using the ca enroll command to obtain CA-signed certificates for each of the two special-purpose RSA key pairs the PIX Firewall generated (using the ca generate rsa specialkey command). When the failure occurs, PIX Firewall displays the following error messages:
CRYPTO_PKI: status = 100: certificate is grantedCRYPTO_PKI: Error: Invalid format for BER encoding while##########In GetRecipientInfo: 315CRYPTO_PKI: status = 266: failed to open the envelopeThe certificate enrollment request failed!•
When CRL checking is configured as mandatory, PIX Firewall takes about two minutes to poll the CRL from the VeriSign CA Server during ISAKMP negotiation. As a result, ISAKMP negotiation fails with the message "ISAKMP (0): Unknown error in cert validation, 0" and packets are lost until PIX Firewall receives the CRL.
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SSH permits up to 100 characters in a username and up to 50 characters in a password.
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When PIX Firewall creates multiple IPSec SPIs (security parameter indexes), the Cisco VPN 3000 Client uses the latest SPI to send data, but PIX Firewall does not. PIX Firewall does not keep track of the SPIs in the order they were created. PIX Firewall uses the SPI with the highest lifetime, but the latest SPI ends up with less lifetime than the one before.
For example, if you ping from the client and check the inbound and outbound SPIs, Cisco VPN 3000 Client can be seen to use the third (latest) SPI to send the ping, but PIX Firewall uses the second SPI, the one before last, to respond to the ping. The result is that the ping responses return to the Cisco VPN 3000 Client, but are dropped.
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In version 5.1 and prior versions, when you enabled the debug command, output messages displayed at an active terminal session, such as the console or a Telnet session.
In version 5.2 and future versions, PIX Firewall supports multiple console sessions, which means that debug command output messages can be sent to multiple sessions simultaneously, as long as the sessions are enabled. Each session is enabled or disabled independently and there is no effect on other sessions.
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The Cisco VPN 3000 Concentrator Manager series ignores all keepalive messages originating from the PIX Firewall unit.
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PIX Firewall/Cisco VPN 3000 Concentrator Manager: traffic does not restart after power cycling the concentrator.
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The Cisco VPN 3000 Client does not support Group 2 for IKE transform sets.
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From within the Cisco VPN 3000 Client status window, while a tunnel is available, if you press the Space key twice, the client hangs.
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Use of the SNMP ip.ipAddrTable entry requires that all interfaces have unique addresses. If interfaces have not been assigned IP addresses, by default, their IP addresses are all set to 127.0.0.1. Having duplicate IP addresses causes the SNMP management station to loop indefinitely. The workaround is to assign each interface a different address. For example, you can set one address to 127.0.0.1, another to 127.0.0.2, and so on.
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When starting a SSH session, a dot (.) displays on the PIX Firewall console before the SSH user authentication prompt appears.
The dot appears as follows:
pixfirewall(config)# .pixfirewall(config)# .The display of the dot does not affect the functionality of SSH. The dot appears on at the console when generating a server key or when decrypting a message using private keys during SSH key exchange, before user authentication occurs. These tasks can take up to two minutes or longer. The dot is a progress indicator that verifies that the PIX Firewall is busy and has not hung.
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Cisco VPN 3000 Client has to use split tunneling to connect to a remote PIX Firewall unit if the Cisco VPN 3000 Client is going to browse through the private network on the inside of the remote PIX Firewall unit, as well as the local network of the Cisco VPN 3000 Client.
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In version 5.2, when keys and certificates generated with the crloptional parameter to the ca command are replaced with new ones, ISAKMP negotiation fails. This caveat previously worked correctly in version 5.1. This caveat was observed after creating keys and certificates, sending traffic, and removing the keys and certificates on both PIX Firewall units. After new keys and certificates were created with the crloptional parameter to the ca command and new traffic started, ISAKMP negotiations failed.
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An ip local pool range cannot have multiple subnets.
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Port numbers are not appearing in syslog when using ACL.
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If PIX Firewall crashes, it attempts to run the show tech-support command. A long configuration can cause further crashes.
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PIX Firewall using RADIUS or TACACS+ requires username and password pairs for authentication, but only authorizes based on IP addresses. Once a multiuser host has been authenticated, all other users on that host are granted authentication. This may allow unauthorized users access to services normally denied them.
Setting the uauth timeout to zero partially solves this problem, but makes Web browsing difficult for authorized users because they must reauthenticate for every new page they view.
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The Cisco VPN 3000 Concentrator Manager, only supports a limited number of IPSec transform sets. The Cisco VPN 3000 Concentrator Manager does not support the AH protocol. The supported transform sets are as follows:
esp-des esp-md5-hmacesp-des esp-sha-hmacesp-3des esp-md5-hmacesp-3des esp-sha-hmacesp-null esp-md5-hmac•
If you downgrade your license key from a UR to an R, thereby restricting the number of supported interfaces, PIX Firewall removes all commands from your configuration that reference the unsupported interfaces. In addition, PIX Firewall also removes all nat and static commands from the configuration.
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PIX Firewall behaves differently when used with and without Xauth in combination with IKE Mode Config when used with the Cisco Secure VPN Client. Refer to the second bullet item in "Cisco Secure VPN Client" for more information.
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The aaa authorization except command does not work for UDP.
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Crash in Crypto PKI RECV thread during certificate enrollment.
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The following syslog message incorrectly displays a field as "<>":
%PIX-3-106014: Deny inbound icmp src outside:IP_addr dst <>:IP_addr (type 0, code 0)
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Small ARP timeouts cause short periods of packet loss.
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Interface routing should be based on the DNAT address.
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Outbound filtering is not working correctly. An example is as follows:
outbound 2 permit 0.0.0.0 0.0.0.0 0 tcpoutbound 2 deny 192.168.85.51 255.255.255.255 0 ipoutbound 2 deny 192.168.85.51 255.255.255.255 0 tcpapply (inside) 2 outgoing_srcIf you do not have the third command statement, the second line does not stop TCP packets. It may sound logical, the protocol values may be UDP, TCP, or the ICMP protocols. In this case, ip is not a valid protocol, and thus, not evaluated by the PIX Firewall, but it is not denied by PIX Firewall command line parser.
Resolved Caveats - Release 5.2(1)
The following caveats were resolved:
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H.323 now correctly performs NAT on IP addresses configured with the alias command.
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The fixup protocol rtsp command no longer allocates the wrong server port for QuickTime.
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When using the fixup protocol ftp strict command, FTP communications between a server that advertises a big welcome banner, and a Windows 2000 or Netscape Communicator 4.73 client now works correctly.
Previously, these types of FTP connections were treated as intrusion events and dropped. The problem occurred because these clients issued the next command before receiving the complete advertised banner from the server. PIX Firewall treated this as a pipelined command, which with the strict option, is treated as an intrusion event.
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PIX Firewall no longer crashes during Cisco Secure PM configuration downloads.
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All inside interface static route command statements now appear in the configuration. Previously, an RIP-generated route overrode the static route and kept it from appearing in the configuration. Now the static route overrides an RIP-generated route.
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PIX Firewall no longer creates two PPTP tunnels for the same client.
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The configure net command no longer changes the severity level of the logging history command.
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Failover with an Ethernet cross-over cable no longer causes the configuration in the Standby unit to be lost and the network to become temporarily unavailable.
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PIX Firewall now verifies that an xlate is linked to a host object; if not, the "no local host infor" message appears when the show xlate debug command is used. Previously, Telnet sessions were being lost during Stateful Failover.
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Creates the sysopt route dnat command, which specifies that when an incoming packet does a route lookup, the incoming interface is used to determine which interface the packet should go to and what is the next hop.
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On PIX Firewall, you can configure multiple vpngroup command statements when using certificates with the Cisco VPN 3000 Client. This can be done only when the name of the vpngroup command statement you specify on the PIX Firewall is the same as the Organizational Unit (OU) field of the certificate on the client. When PIX Firewall is processing the client's certificate, it uses the value of the OU field of the certificate to associate with the vpngroup command statement and uses that.
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Multiple SMTP commands contained in a single packet are no longer permitted and are now dropped.
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Uauth now shows the correct address specified by the ip local pool command when doing xauth with a VPN Client. Previously, this problem noted that ISP assigned address appeared instead of the correct pool address.
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Stateful Failover now supports the nat 0 access-list command.
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Specifying an outbound command list_ID greater than 1599 no longer causes a crash. The maximum list_ID value is now 1599.
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The write standby command now clears the configuration of the Secondary unit and its ARP table. The Active unit then sends each configuration command to the Secondary unit. While sending the commands to synchronize the two configurations, the failover IP addresses are now temporarily disabled (set to 0.0.0.0), which prevents the previous condition that when syslog was enabled, the Secondary unit would ARP for the syslog server and cause confusion on the network.
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PIX Firewall now polls the CRL during ISAKMP negotiation to determine if the CRL has expired.
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The embryonic connection count no longer underflows during Stateful Failover.
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The inbound and outbound options to the aaa command are restricted to first and second interfaces only.
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PIX Firewall now supports up to 14,000 outbound command statements in a configuration.
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Syslog message PIX-5-304001 now displays a username. The format of this message is as follows:
%PIX-5-304001: user src_addr Accessed JAVA URL|URL dest_addr: url.•
The tracert command now displays hops beyond the PIX Firewall when using PAT.
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PIX Firewall no longer incorrectly NATs embedded IP addresses with a network static command statement.
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PIX Firewall no longer fails with an assertion error when 50 or more IPSec static peers are configured. In this case, each peer was configured with individual ISAMKP keys, ISAKMP policies, transform sets, and lines to match address access-lists.
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SIP uses three signaling ports, which caused problems for SIP UDP signaling. SIP can also use TCP, but the problems and solutions only apply to UDP signaling. Normally, SIP with UDP has a configurable timer set by default to 30 minutes. This caused the database and signaling connections to remain until this timer expired.
A new timer and flag were added for transient connections, so that a connection will now time out and be closed in 1 minute when the media ports are assigned and connections are made either in the 183 ringing message or the 200 OK response message.
The call is then moved to the active state and the connection address is saved in the database at this time. When the terminating message arrives on a different connection, the active connection address will be retrieved from the database and the UDP flag will be changed on this connection to the transient flag.
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The ISAKMP lifetime specified on the Cisco VPN 3000 Concentrator Manager series is ignored whether or not the group name is defined on the PIX Firewall. When the Cisco VPN 3000 Client starts a connection without a group ID name (no split tunneling), the ISAKMP timer expires and tries to rekey, when it actually should be ignored and not used.
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Disconnecting the Cisco VPN 3000 Client deletes IPSec SAs on the PIX Firewall.
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The failover poll seconds command provides a user-definable failover polling timer.
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PIX Firewall now provides NAT for embedded outside DNAT address in H.225.
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The no ca identity nickname command now clears the CRL list.
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The performance of the fixup command has been improved.
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Added support for Cisco's proprietary RAS messages to let PIX Firewall interoperate with Cisco's gateways and gatekeepers.
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If a hung Telnet session is killed with the terminal monitor command while syslog is enabled, PIX Firewall no longer reboots when a syslog message is sent.
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The logging monitor command used on a Telnet console session no longer hangs the console when the screen display pauses with More.
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ISAKMP keys no longer display with the show config or write terminal commands. The keys now display as follows:
isakmp key ******** address ip_addr netmask mask•
The failover active command now works correctly when the PIX Firewall unit is equipped with FDDI network interfaces.
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Dynamic hookups are now provided for the H.225 call signaling channel.
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If, during an upgrade from version 5.1 to version 5.2, the PIX Firewall detects a version 5.1 ca identity cgi-bin path, it will automatically convert the path into the version 5.2 style cgi-bin path.
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Accounting records for DNS now have the correct port number.
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FDDI line protocol no longer resets to "down" after reloading the image.
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PIX Firewall now permits URLs to be up to 1024 characters long.
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When a pool of addresses set by the ip local pool command is empty, the following syslog message now appears:
%PIX-4-404101: ISAKMP: Failed to allocate address for client from pool poolname•
When the PIX Firewall unit is equipped with Gigabit Ethernet interfaces, the Standby unit in failover no longer fails after using the clear config all command.
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PIX Firewall, when creating an IPSec tunnel, now copies the TOS fields from the incoming packets header into the header of the encrypted packet.
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The clear config command formerly changed the default interface name from pix/intfn to intfn. The caveat resolution now changes the default interface name to intfn.
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The debug failover option command now appears as follows:
tx Failover cable xmitrx Failover cable receiveopen Failover device opencable Failover cable statustxdmp Cable xmit message dump (serial console only)rxdmp Cable recv message dump (serial console only)ifc Network interface status tracerxip IP network failover packet recvtxip IP network failover packet xmitget IP network packet receivedput IP network packet xmitedverify Failover message verifyswitch Failover Switching statusfail Failover internal exceptionfmsg Failover message•
Syslog message %PIX-3-106014 now correctly displays all information. Previously the message appeared with <> to indicate missing information:
Deny inbound icmp src outside:192.168.8.10 dst <>:192.168.205.2 (type 0, code 0)•
PIX Firewall no longer blocks JAVA applets when the filter java command is not enabled.
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The show tech-support command now includes the write terminal command that shows the current configuration. The previous version used the show config command that listed the configuration stored in Flash memory.
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Disabling and enabling the vpdn command to move access to another interface no longer requires rebooting the PIX Firewall.
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PIX Firewall TACACS+ per-user idle and absolute timeouts now work correctly.
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Boothelper can now TFTP through a gigabit interface.
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Syslog message %PIX-6-602301 no longer is preceded with several linefeeds, which made this message unreadable on some syslog servers.
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If two users try to authenticate at approximately same time, PIX Firewall no longer generates two syslog messages with the same username, even though the IP addresses logged correctly. Also, the show uauth command output no longer shows two entries with same username but different IP addresses.
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AAA usernames are now limited to up to 30 characters and passwords are limited to up to 15 characters in length.
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PIX Firewall no longer crashes if a VeriSign CA is accessed without the crloptional parameter to the ca conf command.
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Formerly, if you made a certificate enrollment request without having first generated your RSA keys, the enrollment request terminated with the following error message:
%Error: router certificate exists.The new error message is as follows:
%Error: The signature public key is not found. Abort.Type help or '?' for a list of available commands.•
PIX Firewall now rejects a received CA certificate if an incorrect fingerprint was entered.
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The names command no longer intermittently disables after being configured.
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To track usage among different subnets, you can specify multiple PATs. Before, only one PAT statement could be configured for each configuration.
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To specify PAT using the IP address at the interface, specify the interface keyword.
global interface id address | interface
Related Documentation
Use this document in conjunction with the PIX Firewall and Cisco VPN 3000 documentation at the following sites:
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/prod_technical_documentation.html
http://www.cisco.com/en/US/products/sw/secursw/ps2276/prod_technical_documentation.html
Cisco provides PIX Firewall technical tips at the following site:
http://www.cisco.com/public/support/tac/tools_trouble.shtml
Obtaining Documentation
Cisco provides several ways to obtain documentation, technical assistance, and other technical resources. These sections explain how to obtain technical information from Cisco Systems.
Cisco.com
You can access the most current Cisco documentation on the World Wide Web at this URL:
http://www.cisco.com/univercd/home/home.htm
You can access the Cisco website at this URL:
International Cisco websites can be accessed from this URL:
http://www.cisco.com/public/countries_languages.shtml
Documentation CD-ROM
Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which may have shipped with your product. The Documentation CD-ROM is updated regularly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual or quarterly subscription.
Registered Cisco.com users can order a single Documentation CD-ROM (product number DOC-CONDOCCD=) through the Cisco Ordering tool:
http://www.cisco.com/en/US/partner/ordering/ordering_place_order_ordering_tool_launch.html
All users can order annual or quarterly subscriptions through the online Subscription Store:
http://www.cisco.com/go/subscription
Ordering Documentation
You can find instructions for ordering documentation at this URL:
http://www.cisco.com/univercd/cc/td/doc/es_inpck/pdi.htm
You can order Cisco documentation in these ways:
•
http://www.cisco.com/en/US/partner/ordering/index.shtml
•
Documentation Feedback
You can submit comments electronically on Cisco.com. On the Cisco Documentation home page, click Feedback at the top of the page.
You can send your comments in e-mail to bug-doc@cisco.com.
You can submit comments by using the response card (if present) behind the front cover of your document or by writing to the following address:
Cisco Systems
Attn: Customer Document Ordering
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
For all customers, partners, resellers, and distributors who hold valid Cisco service contracts, the Cisco Technical Assistance Center (TAC) provides 24-hour, award-winning technical support services, online and over the phone. Cisco.com features the Cisco TAC website as an online starting point for technical assistance.
Cisco TAC Website
The Cisco TAC website (http://www.cisco.com/tac) provides online documents and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The Cisco TAC website is available 24 hours a day, 365 days a year.
Accessing all the tools on the Cisco TAC website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a login ID or password, register at this URL:
http://tools.cisco.com/RPF/register/register.do
Opening a TAC Case
The online TAC Case Open Tool (http://www.cisco.com/tac/caseopen) is the fastest way to open P3 and P4 cases. (Your network is minimally impaired or you require product information). After you describe your situation, the TAC Case Open Tool automatically recommends resources for an immediate solution. If your issue is not resolved using these recommendations, your case will be assigned to a Cisco TAC engineer.
For P1 or P2 cases (your production network is down or severely degraded) or if you do not have Internet access, contact Cisco TAC by telephone. Cisco TAC engineers are assigned immediately to P1 and P2 cases to help keep your business operations running smoothly.
To open a case by telephone, use one of the following numbers:
Asia-Pacific: +61 2 8446 7411 (Australia: 1 800 805 227)
EMEA: +32 2 704 55 55
USA: 1 800 553-2447For a complete listing of Cisco TAC contacts, go to this URL:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
TAC Case Priority Definitions
To ensure that all cases are reported in a standard format, Cisco has established case priority definitions.
Priority 1 (P1)—Your network is "down" or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation.
Priority 2 (P2)—Operation of an existing network is severely degraded, or significant aspects of your business operation are negatively affected by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation.
Priority 3 (P3)—Operational performance of your network is impaired, but most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels.
Priority 4 (P4)—You require information or assistance with Cisco product capabilities, installation, or configuration. There is little or no effect on your business operations.
Obtaining Additional Publications and Information
Information about Cisco products, technologies, and network solutions is available from various online and printed sources.
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http://www.cisco.com/en/US/products/products_catalog_links_launch.html
•
•
http://www.cisco.com/go/packet
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http://www.cisco.com/go/iqmagazine
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http://www.cisco.com/en/US/about/ac123/ac147/about_cisco_the_internet_protocol_journal.html
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http://www.cisco.com/en/US/learning/index.html
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