Some help would be really appreciated.

I have a 2820N and a 2820IPPBX (but I don;t use the IPPBX functionality, just as a router)

the 2820N is in the main office and I want to use the 2820 IPPBX as a remote site linking via VPN.

Thought I would start out simply by setting up a PPTP VPN and it worked-ish!

Both routers say connected. They are on separate IP addresses (main office 192.168.1.x and remote on 192.168.2.x) so it all looks to be working

HOWEVER, if I ping an address in the main office from the remote site, I may get one successful ping, but the rest get lost so an 80% failure.

This problem manifests itself all over the place. For instance, I can't connect to shared drives (it doesn't recognise them).

Advise on where I'm going wrong would be appreciated.

Thanks in advance
Iain