Security Configuration Guide: Access Control Lists, Cisco IOS Release 15M&T

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Book Title

Security Configuration Guide: Access Control Lists, Cisco IOS Release 15M&T

Chapter Title

IPv6 ACL Extensions for Hop by Hop Filtering

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Updated:
April 2, 2014

Chapter: IPv6 ACL Extensions for Hop by Hop Filtering

IPv6 ACL Extensions for Hop by Hop Filtering

The IPv6 ACL Extensions for Hop by Hop Filtering feature allows you to control IPv6 traffic that might contain hop-by-hop extension headers. You can configure an access control list (ACL) to deny all hop-by-hop traffic or to selectively permit traffic based on protocol.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature 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.

Information About IPv6 ACL Extensions for Hop by Hop Filtering

ACLs and Traffic Forwarding

IPv6 access control lists (ACLs) determine what traffic is blocked and what traffic is forwarded at device interfaces. ACLs allow filtering based on source and destination addresses, inbound and outbound to a specific interface. Use the ipv6 access-list command to define an IPv6 ACL, and the deny and permit commands to configure its conditions.

The IPv6 ACL Extensions for Hop by Hop Filtering feature implements RFC 2460 to support traffic filtering in any upper-layer protocol type.

How to Configure IPv6 ACL Extensions for Hop by Hop Filtering

Configuring IPv6 ACL Extensions for Hop by Hop Filtering

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    ipv6 access-list access-list-name

    4.    permit protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address | auth} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address | auth} [operator [port-number]] [dest-option-type [header-number | header-type]] [dscp value] [flow-label value] [fragments] [hbh] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [reflect name [timeout value]] [routing] [routing-type routing-number] [sequence value] [time-range name]

    5.    deny protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address | auth} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address | auth} [operator [port-number]] [dest-option-type [header-number | header-type]] [dscp value] [flow-label value] [fragments] [hbh] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name] [undetermined-transport]

    6.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example:
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3 ipv6 access-list access-list-name


    Example:
    Device(config)# ipv6 access-list hbh-acl
     

    Defines an IPv6 ACL and enters IPv6 access list configuration mode.

     
    Step 4 permit protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address | auth} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address | auth} [operator [port-number]] [dest-option-type [header-number | header-type]] [dscp value] [flow-label value] [fragments] [hbh] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [reflect name [timeout value]] [routing] [routing-type routing-number] [sequence value] [time-range name]

    Example:
    Device(config-ipv6-acl)# permit icmp any any dest-option-type
     

    Sets permit conditions for the IPv6 ACL.

     
    Step 5 deny protocol {source-ipv6-prefix/prefix-length | any | host source-ipv6-address | auth} [operator [port-number]] {destination-ipv6-prefix/prefix-length | any | host destination-ipv6-address | auth} [operator [port-number]] [dest-option-type [header-number | header-type]] [dscp value] [flow-label value] [fragments] [hbh] [log] [log-input] [mobility] [mobility-type [mh-number | mh-type]] [routing] [routing-type routing-number] [sequence value] [time-range name] [undetermined-transport]


    Example:
    Device(config-ipv6-acl)# deny icmp any any dest-option-type
     

    Sets deny conditions for the IPv6 ACL.

     
    Step 6end


    Example:
    Device (config-ipv6-acl)# end
     

    Returns to privileged EXEC configuration mode.

     

    Configuration Example for IPv6 ACL Extensions for Hop by Hop Filtering

    Example: IPv6 ACL Extensions for Hop by Hop Filtering

    Device(config)# ipv6 access-list hbh_acl
Device(config-ipv6-acl)# permit tcp any any hbh
Device(config-ipv6-acl)# permit tcp any any
Device(config-ipv6-acl)# permit udp any any
Device(config-ipv6-acl)# permit udp any any hbh
Device(config-ipv6-acl)# permit hbh any any
Device(config-ipv6-acl)# permit any any
Device(config-ipv6-acl)# hardware statistics
Device(config-ipv6-acl)# exit

! Assign an IP address and add the ACL on the interface.

Device(config)# interface FastEthernet3/1
Device(config-if)# ipv6 address 1001::1/64
Device(config-if)# ipv6 traffic-filter hbh_acl in
Device(config-if)# exit
Device(config)# exit
Device# clear counters
Clear "show interface" counters on all interfaces [confirm]
Device# 

! Verify the configurations.

Device# show running-config interface FastEthernet3/1

Building configuration...

Current configuration : 114 bytes
!
interface FastEthernet3/1
no switchport
ipv6 address 1001::1/64
ipv6 traffic-filter hbh_acl
end

    Additional References

    Related Documents

    Related Topic

    Document Title

    Cisco IOS commands

    Cisco IOS Master Command List, All Releases

    IPv6 commands

    Cisco IOS IPv6 Command Reference

    Security commands

    IPv6 addressing and basic connectivity

    IPv6 Addressing and Basic Connectivity Configuration Guide

    IPv6 features

    IPv6 Feature Mapping

    RFCs for IPv6

    IPv6 RFCs

    Standards and RFCs

    Standard/RFC

    Title

    RFC 2460

    Internet Protocol, Version 6 (IPv6)

    Technical Assistance

    Description

    Link

    The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

    http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

    Feature Information for IPv6 ACL Extensions for Hop by Hop Filtering

    The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. 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 Hop by Hop Filtering

    Feature Name

    Releases

    Feature Information

    IPv6 ACL Extensions for Hop by Hop Filtering

    15.1(1)SG

    15.1(1)SY

    15.2(3)T

    15.3(1)S

    Allows you to control IPv6 traffic that might contain hop-by-hop extension headers.

    The following commands were introduced or modified: deny (IPv6), permit (IPv6).

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