BT 1800HG router is blocking VPN

[namni]

I am having real trouble configuring a BT 1800HG wireless router to let any incoming traffic through from the VPN.
I can get authenticated on the network but then I can't ping anything. I have tried using a Speedtouch 510 and it works fine so it's definately the router.
Has anyone used one of these?
I have tried to configure the firewall to allow PPTP ports to talk to each other but it's not working and I'm at my wits end!!

All replies appreciated, thanks!

 

[LloydSev]

If the person can get authenticated and connected, there there isn't generally a port being blocked. At that time it becomes about permissions. Most home routers will not route traffic on another subnet.

Computer/Network Technician
CCNA