Ccna routing and Switching Complete Study Guide


Troubleshooting IPv6 Extended Access Lists



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Todd Lammle-CCNA Routing and Switching Complete Study Guide Exam 100-105, Exam 200-105, Exam 200-125-Sybex (2016)

Troubleshooting IPv6 Extended Access Lists

Let’s create an extended IPv6 ACL on R2, pretty much just like we did in the IPv4 

troubleshooting section.

First, understand that you can only create named extended IPv6 ACLs, so you don’t 

need to specify standard or extended in your named list, and although you won’t see any 

sequence numbers, you can still somewhat edit a named IPv6 ACL, meaning you can delete 

a single line but there is no way to insert a line other than at the end of the ACL.

In addition, every IPv4 access list has an implicit 

deny ip any any

 at the bottom; however, 

IPv6 access lists actually have three implied statements at the bottom:

 



permit icmp any any nd-na

 



permit icmp any any nd-ns

 



deny ipv6 any any

The two permit statements are required for neighbor discovery, which is an important 

protocol in IPv6, because it’s the replacement for ARP.

Using the network layout and IPv6 addresses in Figure 20.4, let’s create an 

IPv6 extended named ACL that blocks Telnet to Server1 (with an IPv6 address of 

2001:db8:3c4d:1:a14c:8c33:2d1:be3d) from PC1 (with a destination IPv6 address of 

2001:db8:3c4d:3:2ef:1823:8938). Since it’s an IPv6 extended named ACL (always), we’ll 

place it closest to the source address if possible.




Troubleshooting IPv6 Network Connectivity 

859

Step 1: Test that you can telnet to the remote host.

R1#


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