December 2006
Intermediate to advanced
1188 pages
72h 8m
English
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Filtering IPv6
Problem
You want to filter IPv6 traffic using access-lists.
Solution
Cisco supports named access-lists for IPv6:
Router1#configure terminalEnter configuration commands, one per line. End with CNTL/Z. Router1(config)#ipv6 access-listRouter1(config-ipv6-acl)#EXAMPLESpermit ipv6AAAA:5::/64anyRouter1(config-ipv6-acl)#permit ipv6 hostAAAA:5::FE:1anyRouter1(config-ipv6-acl)#permit tcp any any eq telnet establishedRouter1(config-ipv6-acl)#deny tcp any any eq telnet synRouter1(config-ipv6-acl)#sequence55permit udp any any eq snmpRouter1(config-ipv6-acl)#remarkRouter1(config-ipv6-acl)#this is a commentsequence66remarkRouter1(config-ipv6-acl)#this comment has a sequence numberpermit icmp any any reflectRouter1(config-ipv6-acl)#ICMP-REFLECTdeny ipv6 any host AAAA:6::1 logRouter1(config-ipv6-acl)#deny ipv6 any any log-inputRouter1(config-ipv6-acl)#exitRouter1(config)#interfaceRouter1(config-if)#FastEthernet0/0ipv6 traffic-filterEXAMPLESinRouter1(config-if)#exitRouter1(config)#endRouter1#
Discussion
The ACL shown in this example isn’t particularly useful, but it does show many of the features available with IPv6 access-lists. There are only named IPv6 access-lists, as numbered lists do not exist. However, as we previously saw in Recipes 19.11 and 19.15, this is not a drawback. Anything you can do with numbered access-lists, you can do with named access-lists, and several features such as reflexive access-lists and the ability to edit individual lines ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.