Cisco IPv6 ADSL Configuration

How do I enable IPv6 and Prefix Delegation on my Cisco Router?

! Enable IPv6
ipv6 cef
ipv6 unicast-routing

! Enable IPv6 and Prefix Delegation on the WAN interface
interface Dialer0
 ipv6 address autoconfig default
 ipv6 enable
 ipv6 dhcp client pd NODE-PD rapid-commit
ipv6 route ::/0 Dialer0

! Enable IPv6 and Prefix Delegation on the LAN interface
interface Vlan1
 ipv6 address NODE-PD ::1/64
 ipv6 enable

How do I know if I am visiting a website via IPv6 or IPv4?

Firefox users can add the "ShowIP" extension:
https://addons.mozilla.org/en-US/firefox/addon/590?id=590

How do I configure an IPv6 firewall on my Cisco router?

Here is a starting point for basic IPv6 Cisco IOS firewall:

ipv6 inspect name STD6 udp
ipv6 inspect name STD6 ftp
ipv6 inspect name STD6 icmp

ipv6 access-list INTERNET-IN-ACL6
 permit icmp any any
 permit tcp any any established
 permit udp any any eq 546
 deny ipv6 any any

ipv6 access-list DENY-ACL6
 permit icmp any any
 permit tcp any any established
 deny ipv6 any any

interface Dialer0
 ipv6 verify unicast reverse-path
 ipv6 inspect STD6 out
 ipv6 traffic-filter INTERNET-IN-ACL6 in

interface Vlan1
 ipv6 verify unicast reverse-path
 ipv6 inspect STD6 out
 ipv6 traffic-filter DENY-ACL6 out

There is currently a bug (CSCtb10776) with IPv6 CBAC on Cisco which breaks TCP Window Scaling. Hence the "tcp" inspect module has been omitted and substituted with "permit tcp any any established".

How do I get IPv6 via wireless on 877W?

At least IOS 12.4(22)T3 is required to support IPv6 via a wireless Dot11Radio interface

Why don't my hosts get IPv6 addresses when I bridge my WLAN and LAN interfaces?

Cisco does not currently support IPv6 via BVI interfaces. If you use separate routed interfaces (Eg, Vlan1 and Dot11Radio0.1) for your LAN and WLAN interfaces it will work.

Why does IPv6 traffic stop working after my PPP session reconnects?

Cisco IOS currently fails to immediately renew the DHCPv6 PD lease after PPP renegotiates. You can manually force DHCPv6 to renew the lease by running "clear ipv6 dhcp client Dialer0". Alternatively the router should renew the DHCPv6 release in less than an hour.