I am trying to make a setup for LAN-to-LAN over PPTP. My pptp client is on Windows Server 2003, and connects to the remote network through a PIX515. Connections to the remote network are fine, and I am able to connect to multiple machines on the remote network from the client just fine.
For other machines on the LAN, they are able to get TO the client machine, but no further. The traceroute shows it getting to the client, and then nothing. At first I was thinking that this was a routing issue, but after running WireShark on the pptp client, I can see packets coming into it and trying to get to the remote systems, but then no response. So now I am thinking that the problem is related to translation, since the remote system would have no way of knowing how to get packets back to the originating machines.
I have Routing and Remote Access setup, and it connects to the pptp system via this (rather than manually selecting a new network connection).