IPv6 config

[KodiakAK]

I have some IPv6 addresses I can use to get out to the internet, and I am trying to configure routing between two interfaces on a cisco 1841.

interface FastEthernet0/1/0
description IPV6 TEST PORT
no ip address
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
ipv6 address autoconfig
ipv6 enable
ipv6 traffic-filter IPV6ACL in
!
interface FastEthernet0/1/1
no ip address
duplex auto
speed auto
ipv6 address autoconfig
ipv6 enable
ipv6 traffic-filter IPV6ACL in
!
ipv6 access-list IPV6ACL
ipv6 route ::/0 FastEthernet0/1/0

rtr#show ipv6 interface bri
FastEthernet0/1/0 [up/up]
FE80::xxxxxxxxxxx
2001:470:xxxxxxxxx
FastEthernet0/1/1 [up/up]
FE80::xxxxxxxxxx


Why isnt my Fa0/1/1 autoconfiguring, and
how do I set my default gateway?

 

[KodiakAK]

for the next noob that comes around, I discovered:

autoconfigure takes fe80 and adds it to the front of the mac address of the NIC (plus some filler in the mac address part)

if you get assigned a block of addresses, they get pasted on where fe80 goes and it becomes globally unique.

(config)# ipv6 unicast-routing

default route
ipv6 route ::/0 2001:470:xxx

I also realized that fe80 is the autoconfigure ipv6 address, and the unique address will just have 2001:470:xxxx pasted on the front so from interface I manually configured the ipv6 address.


still working on being able to ping from a device on fa0/1/1 to int fa/0/1/0

 

[Quadratic]

FE80's are link-local addresses, similar to the IPv4 APIPA range of 169.254.0.0/16. A router should not route between link-local networks. This is NOT the same as a site-local scope address, (eg: 172.16.0.0/12). IPv6 used to have a site-local private range (FEC0 prefix), though they got rid of it at some point.

If you want routable addresses to be assigned during autoconfiguration, add "ipv6 nd prefix [prefix]/[length]" to the interface in question, where the prefix is in a global unicast range.

CCNP, CCDP, CCIP
Core Network Planner, ISP