First off I'm not really sure if PPTP is the best protocol to be doing this with, but it's what I'm testing for now.
The situation is that I have a Ubuntu 10.10 server at my house, which uses a dynamic IP that I get from my ISP. I use this server solely for experimentation so messing something up isn't an issue for me. My friend and I want to test a method through which we can pipe all traffic leaving his router (PPTP) to the server at my house and then have it seamlessly pass on to the internet.
I have configured a DNS server, as best I can, and an openSSH server on the linux box. Set my router to allow the ubuntu box to be in the DMZ to get rid of (local) firewall problems, and instructed the server to forward all traffic received on port 1723 to the ISP's DNS seeing itself as a proxy for traffic coming from the WAN IP of the remote LAN.
However, when we point the remote LAN to my IP where the server is, I don't see any traffic coming through using Wireshark on both the server, and a Win 7 box on the local LAN. Furthermore, the remote LAN just times out its WAN connections, despite being able to ping the server??? And to top it all off, the local router here experiences a DoS condition of sorts... So despite having the server in a DMZ my (belkin) router is either still stopping the traffic? Or the server is doing some horrendous loopback trick that I cannot (don't know how to) see, being new to linux and all
Any help on how to set this config set up would be awesome. Thanks!