Last week I finally bought a decent router (Netgear WNDR 3700) after having problems with the 2 Wire modem router that Telecom supplied a year ago.  I am using a TP-Link wireless modem router in half-bridge mode for the ADSL connection, which works well.

However, I'd like to install the TP-Link at my parent's place so I can have wireless when I stay there, and bought a new RTA1320V6 on TradeMe.  I tried it in standard PPPoA mode to check it and it works fine and syncs at a slightly higher speed than the TP-Link.

So I set it to half-bridge mode using the same settings as the TP-Link (both Broadcom chipsets) and connected it to the router.  The router happily gets a connection through the modem and everything looks the same.  My PC thinks it has a connection to the Internet but can't get to anything.  The DSL light on the modem never flashes though, so it looks as though it's not communicating.

Any ideas what might be happening?  Is the V6 version different in some way to the older 1320?  I can plug a PC directly into the modem when it's in half-bridge mode and this works fine.