IPv6 PPPoE on OpenWRT

Teksavvy, a canadian provider, is offering IPv6 service through DSL PPPoE. As an IPv6 oldtimer, I subscribe to their service to give it a try. They gave me an IPv4-only PPPoE service userid/password and an IPv4 and IPv6 PPPoE service userid/password. The IPv6 service includes a /64 for the PPP link and a /56 for the home network. This blog describes how to have OpenWRT (BackFire 10.03.1-RC1) running as the PPPoE end host and advertising and routing the prefix in the home network. Using 2001:db8:1:1::/64 as prefix for PPP link and 2001:db8:2::/56 for home prefix. Choosing 2001:db8:2:1::1/64 out of the /56 for the interface on the LAN side. Only relevant changes in configuration files are shown.

Here are the steps:

OpenWRT Backfire does not have IPv6 enabled by default:

# opkg update; opkg install kmod-ipv6
Configure IPv6 on the WAN and LAN side:

# cat /etc/config/network

config 'interface' 'lan'

option 'ip6addr' '2001:db8:2:1::1/64'

config 'interface' 'wan'

option 'proto' 'pppoe'

option 'username' 'userid@provider'

option 'password' 'mypassword'

option 'ipv6' '1'

Install and Configure the Router Advertisement daemon to advertise the prefix on the home LAN.

# opkg install radvd

#cat /etc/config/radvd

config interface

option interface 'lan'

option ignore 0

config prefix

option interface 'lan'

option prefix '2001:db8:2:1::/64'

option ignore 0

# ln -s /etc/init.d/radvd /etc/rc.d/S50radvd

Reboot

The /etc/ppp/ipv6-up and ipv6-down scripts are already configured to create the default IPv6 route to the PPP interface.

It works!

# ping6 www.viagenie.ca

ping6 www.viagenie.ca

PING6(56=40+8+8 bytes) 2001:db8:2:1:5123:35ff:fef4:1234 --> 2620:0:230:8000::2

16 bytes from 2620:0:230:8000::2, icmp_seq=0 hlim=50 time=55.993 ms

16 bytes from 2620:0:230:8000::2, icmp_seq=1 hlim=50 time=56.896 ms

16 bytes from 2620:0:230:8000::2, icmp_seq=2 hlim=50 time=56.585 ms

^C

--- jazz.viagenie.ca ping6 statistics ---

3 packets transmitted, 3 packets received, 0.0% packet loss

round-trip min/avg/max/std-dev = 55.993/56.491/56.896/0.375 ms

Note that there is no IPv6 firewall configured by default.