Progress.

At least with the BigPond installation. Logged into the router and changed B&G to B(legacy)&G, and it worked.

I also turned on the firewall. Okay the router firewall was off, as was the Windows firewall on the PC I was using. WILL PC USERS NEVER LEARN?! >

When I go and deal with the D-Link router, I will look for a similar option. At least I know the firewall on that router is on.

Nick