IPv6 ACL Extensions for IPsec AuthenticationHeaders

The IPv6 ACL Extensions for IPsec Authentication Headers feature allows TCP or UDP parsing when anIPv6 IPsec authentication header is present.

This module describes how to configure TCP or UDP matching regardless of whether an authenticationheader (AH) is present or absent.

• Finding Feature Information, page 1

• Information About IPv6 ACL Extensions for IPsec Authentication Header, page 2

• How to Configure IPv6 ACL Extensions for IPsec Authentication Header, page 2

• Configuration Examples for IPv6 ACL Extensions for IPsec Authentication Header, page 4

• Additional References, page 4

• Feature Information for IPv6 ACL Extensions for IPsec Authentication Header, page 5

Finding Feature InformationYour software release may not support all the features documented in this module. For the latest caveats andfeature information, see Bug Search Tool and the release notes for your platform and software release. Tofind information about the features documented in this module, and to see a list of the releases in which eachfeature is supported, see the feature information table.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support.To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

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Information About IPv6 ACL Extensions for IPsec AuthenticationHeader

IPv6 ACL Extensions for IPsec Authentication HeaderThis feature provides the ability to match on the upper layer protocol (ULP) (for example, TCP, User DatagramProtocol [UDP], ICMP, SCTP) regardless of whether an authentication header (AH) is present or absent.

TCP or UDP traffic can be matched to the upper-layer protocol (ULP) (for example, TCP, UDP, ICMP, SCTP)if an AH is present or absent. Before this feature was introduced, this function was only available if an AHwas absent.

This feature introduces the keyword auth to the permitand denycommands. The auth keyword allowsmatching traffic against the presence of the authentication header in combination with the specified protocol;that is, TCP or UDP.

IPv6 traffic can be matched to a ULP when an AH header is present. To perform this function, enter the ahpoption for the protocol argument when using the permit or deny command.

How to Configure IPv6 ACL Extensions for IPsec AuthenticationHeader

Configuring TCP or UDP MatchingTCP or UDP traffic can be matched to the ULP (for example, TCP, UDP, ICMP, SCTP) if an AH is presentor absent. Before this feature was introduced, this function was only available if an AH was absent.

Use of the keyword auth with the permit icmp and deny icmp commands allows TCP or UDP traffic to bematched to the ULP if an AH is present. TCP or UDP traffic without an AH will not be matched.

IPv6 traffic can be matched to a ULP when an AH header is present. To perform this function, enter the ahpoption for the protocol argument when using the permit or deny command.

Perform this task to allow TCP or UDP traffic to be matched to the ULP if an AH is present.

SUMMARY STEPS

1. enable2. configure terminal3. ipv6 access-list access-list-name4. permit icmp auth

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IPv6 ACL Extensions for IPsec Authentication HeadersInformation About IPv6 ACL Extensions for IPsec Authentication Header

DETAILED STEPS

PurposeCommand or Action

Enables privileged EXEC mode.enableStep 1

Example:

Router# enable

• Enter your password if prompted.

Enters global configuration mode.configure terminal

Example:

Router# configure terminal

Step 2

Defines an IPv6 access list and places the router in IPv6access list configuration mode.

ipv6 access-list access-list-name

Example:

Router(config)# ipv6 access-list list1

Step 3

Specifies permit or deny conditions for an IPv6 ACL usingthe auth keyword, which is used to match against thepresence of the AH.

permit icmp auth

Example:

Step 4

Example:

or

Example:

deny icmp auth

Example:

Router(config-ipv6-acl)# permit icmp auth

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IPv6 ACL Extensions for IPsec Authentication HeadersConfiguring TCP or UDP Matching

Configuration Examples for IPv6 ACL Extensions for IPsecAuthentication Header

Example: Configuring TCP or UDP MatchingThe following example allows any TCP traffic regardless of whether or not an AH is present:

IPv6 access list example1permit tcp any any

The following example allows TCP or UDP parsing only when an AH header is present. TCP or UDP trafficwithout an AH will not be matched:

IPv6 access list example2deny tcp host 2001::1 any log sequence 5permit tcp any any auth sequence 10permit udp any any auth sequence 20

The following example allows any IPv6 traffic containing an authentication header:

IPv6 access list example3permit ahp any any

Additional ReferencesRelated Documents

Document TitleRelated Topic

IPv6 Configuration GuideIPv6 addressing and connectivity

Cisco IOSMaster Commands List,All Releases

Cisco IOS commands

Cisco IOS IPv6 CommandReference

IPv6 commands

Cisco IOS IPv6 Feature MappingCisco IOS IPv6 features

Standards and RFCs

TitleStandard/RFC

IPv6 RFCsRFCs for IPv6

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IPv6 ACL Extensions for IPsec Authentication HeadersConfiguration Examples for IPv6 ACL Extensions for IPsec Authentication Header

MIBs

MIBs LinkMIB

To locate and downloadMIBs for selected platforms,Cisco IOS releases, and feature sets, use Cisco MIBLocator found at the following URL:

http://www.cisco.com/go/mibs

Technical Assistance

LinkDescription

http://www.cisco.com/cisco/web/support/index.htmlThe Cisco Support and Documentation websiteprovides online resources to download documentation,software, and tools. Use these resources to install andconfigure the software and to troubleshoot and resolvetechnical issues with Cisco products and technologies.Access to most tools on the Cisco Support andDocumentation website requires a Cisco.com user IDand password.

Feature Information for IPv6 ACL Extensions for IPsecAuthentication Header

The following table provides release information about the feature or features described in this module. Thistable lists only the software release that introduced support for a given feature in a given software releasetrain. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support.To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 1: Feature Information for IPv6 ACL Extensions for IPsec Authentication Header

Feature InformationReleasesFeature Name

The IPv6ACL extensions for IPsecauthentication headers featureallows TCP or UDP parsing whenan IPv6 IPsec authentication headeris present.

The following commands wereintroduced or modified: deny, ipv6access-list, permit.

12.4(20)TIPv6 ACL Extensions for IPsecAuthentication Header

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IPv6 ACL Extensions for IPsec Authentication HeadersFeature Information for IPv6 ACL Extensions for IPsec Authentication Header

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IPv6 ACL Extensions for IPsec Authentication HeadersFeature Information for IPv6 ACL Extensions for IPsec Authentication Header