I have successfully set up two of these on Plus.net FTTC trial, here's what I did: -

• * Plug the VDSL modem LAN port into WAN2 on tho 2820 router.
  * WAN >> General: Disable WAN1, enable WAN2, Name it, mode:Ethernet, Auto Negotiation, Always on
  * OK
  * WAN >> Internet Access: WAN1 (PPPoA): disable
  * OK (may reboot)
  * WAN >> Internet Access: WAN2 (PPPoE): enable, set username & password, leave the rest as default.
  * OK (may reboot)

And that was it mostly.

• >> If you use VPN you may want to look at its settings, some of them say a WAN number.
  >> If you use QoS you may need to set that for WAN2 & when you know your bandwidth up/down, set it in QoS WAN2.

My ISP is plusnet but the FTTC VDSL is provided by BT, as are most of the FTTC offerings.

Thanks for the info - that's pretty much what I did and it's working nicely. I had a bit of a problem with keeping a stable connection to the wireless network after making those changes but an upgrade to firmware 3.3.3 (had been on 3.2.1 before) and a bit of tweaking of the settings eventually got it working again.