IPv6 on Cisco 2800 and 3750

[mchance]

I have a Cisco 2821 connected OSPF to a Cisco 3750. I configured my outside port 

interface GigabitEthernet0/0
description OUTSIDE
ip address dhcp
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
ipv6 address dhcp
ipv6 address autoconfig
ipv6 enable

I am receiving an IPv6 address of 

2600:8807:9F02:1:90B8:CB64:58A9:2307, subnet is 2600:8807:9F02:1:90B8:CB64:58A9:2307/128

My question is; Now what? How do I get my other devices to get an IPv6 address? Everything I have found on it starts with the assumption of static IP's from my provider. Cox doesn't do static for anything unless you pay for the commercial account.

[Harold Ritter]

These ND Duplicate messages are trigerred by the Duplicate Address Detection (DAD) mechanism. Not sure why you are getting them, but try disabling DAD with the following command on the WAN interface:

ipv6 address dhcp rapid-commit

Leave the "debug ipv6 dhcp" on and see if it gets rid of these ND duplicate messages.

Regards,

[mchance]

That didn't work so I did "ipv6 nd dad attempts 0" and got an IP. I got the prefix delegation from hooking up a Linksys router and setting it to auto. Where do I put the prefix delegation and how do I get my other devices to pick up the IP's?

[mchance]

So this is my config with the new info. I am able to ping the outside interface from the outside world but no the inside. Where do I go from here?

interface GigabitEthernet0/0
description OUTSIDE
ip address dhcp
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
ipv6 address dhcp
ipv6 address autoconfig
ipv6 enable
ipv6 nd dad attempts 0
ipv6 nd autoconfig default-route
ipv6 dhcp client pd hint ::/64
ipv6 dhcp client pd COX
!
interface GigabitEthernet0/1
description INSIDE
ip address 10.0.0.9 255.255.255.252
ip nat inside
ip virtual-reassembly in
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 7 0702364F1F514A51
ip ospf 10 area 0
duplex auto
speed auto
ipv6 address 2600:8807:8500:E1::/64 eui-64
ipv6 address autoconfig
ipv6 enable

[mchance · Accepted solution]

I got it working! I have IPv6 on my inside and outside ports and on the switch port. All are pingable from the outside world. It started working once I got the delegation from the linksys router. Thank you, everyone, for your help.