The TG582N is a 4 port ADSL router, and can be configured so that one of the ethernet ports can support PPPoE - for connecting to an external FTTC Modem as it does not have a built-in VDSL modem. It has Wi-Fi too.
See the TG582N page for further information, and configuration notes (problems & fixes)
Other routers that we've used in the past
Billion BiPAC 7800N
Factory IP: 192.168.1.254 Factory User/Pass: admin/admin
Latest Firmware is from Billion As of October 2011 the version we ship is 1.06d
We have a copy of 1.06d here: media:UKBillion7800NV6 106d.zip
Another useful Billion page on spaldwick.com
Info here: *Comtrend
Apple Airport Extreme
The Airport Extreme claims to support native IPv6 over PPPoE but we don't know of anyone who has it working. It still works via tunnels though (tunnel configuration explained on the knowledge base). You need to set the remote tunnel endpoint address to 188.8.131.52, and you need two /64 subnets off us that are statically routed to the Airport's IPv4 address. Assign an IP from one /64 as the WAN address and set the default route to our ping address "bottomless", which is 2001:8b0:0:81::51bb:51bb. Set the LAN address to the first usable IP on the second /64 and it should just work.
Note that the firmware 7.6.3 breaks tunnels configured under earlier firmware but there is a simple fix. Using the latest version of Airport Utility you need to add an IPv6 Delegated Prefix. The easy way seems to be to copy and paste the address from the IPv6 LAN address field and add /64 to the end - otherwise it assumes a /48. Further details here: http://arstechnica.com/apple/2013/02/airport-extreme-update-breaks-ipv6-tunnels-but-heres-how-to-fix-it/
The RT-N66U does pretty much "just work" with IPv6. Running the TomatoUSB firmware it was just a case of enabling "Native IPv6" in the IPv6 options and giving the router's LAN interface an address from the allocated /64. The router appears to have enabled RA by default, so everything on the LAN side "just works"
From a customer:
"The current v8 firmware does support IPv6 properly, but for it to be distributed to connected devices, not only DHCPv6 needs to be enabled, but also RADVD (this setting is not currently described in the modem's user manual). Leaving the sub-settings for RADVD to their default seems fine."