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Centurylink IPv6 - 6RD Tunnel

Hello All, 

I currently have Centurylink DSL service (I know but its the best I can do with what I got) that is terminating to an ADSL WIC card in a Cisco 2821 router. I read some documentation that says that Centurylink supports IPv6 and I wanted to give it a shot. I have searched a lot of documentation but have found little that is helpful as most of it is related to the use of one of there modems. I do not have a static IP address from them but I believe I should be able to get this configured without one if my understanding is correct. 

With the config I have at this point in time I am able to get the GigabitEthernet 0/1 to pull an IPv6 address as well as all of the clients on the network. The issue I am having is that they are ONLY receiving an IPv6 address and not an IPv6 default gateway or DNS server I am also unable to ping any IPv6 addresses from the router itself; however, I am able to ping the IPv6 addresses that got assigned to the internal hosts.

Here is my current config related to this project: 

ipv6 general-prefix Centurylink6RD 6rd Tunnel1
ipv6 unicast-routing
ipv6 cef

interface Tunnel1
description Centurlylink 6RD Tunnel
no ip address
no ip redirects
ip mtu 1472
ipv6 enable
tunnel source BVI2
tunnel mode ipv6ip 6rd
tunnel 6rd prefix 2602::/24
tunnel 6rd br 205.171.2.64

interface GigabitEthernet0/1
description IPv6 Test Network
no ip address
ip virtual-reassembly in
ip tcp adjust-mss 1452
duplex auto
speed auto
ipv6 address Centurylink6RD ::/64 eui-64
ipv6 enable

interface BVI2
ip address dhcp
ip nat outside
ip virtual-reassembly in

ipv6 route ::/0 Tunnel1 2602:CD:AB02:4000::

I believe that 2602:CD:AB02:4000:: is correct but I am not 100%, I feel the symptoms do point to some form of a routing issue. 

Any help would be greatly appreciated! 

1 Reply 1

I have made the following changes to my config and now am a bit further than I was before. I can now obtain an address on my computer as well as DNS and ping IPv6 addresses on the inter as well as browse the IPv6 web. When I look at the default gateway address my computer has it has an IPv6 link-local address through...

Here is my current config relevant to IPv6:

ipv6 source-route
ipv6 general-prefix Centurylink6RD 6rd Tunnel1
ipv6 unicast-routing
ipv6 cef
ipv6 dhcp pool IPv6DHCP
dns-server 2001:4860:4860::8888
dns-server 2001:4860:4860::8844

ipv6 multicast-routing

interface Tunnel1
description Centurlylink 6RD Tunnel
no ip address
no ip redirects
ip mtu 1472
ipv6 enable
tunnel source BVI2
tunnel mode ipv6ip 6rd
tunnel path-mtu-discovery
tunnel 6rd prefix 2602::/24
tunnel 6rd br 205.171.2.64

interface GigabitEthernet0/1
description IPv6 Test Network
no ip address
ip virtual-reassembly in
ip tcp adjust-mss 1452
duplex auto
speed auto
ipv6 address Centurylink6RD 0:0:0:1::/64 eui-64
ipv6 enable
ipv6 nd autoconfig prefix
ipv6 nd autoconfig default-route
ipv6 nd other-config-flag
ipv6 dhcp server IPv6DHCP

ipv6 route ::/0 Tunnel1 2602:CD:AB02:4000::

Although I am now able to access the IPv6 web from my computer I am not from the router itself, i can't ping any external addresses on internal. If there is any optimizations to be made or further explanation it would be greatly appreciated! 

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