In my apartment, the management provides the building with a network connection. I have my computer plugged into the ethernet coming out of the walls, and my friend who also lives in the apartment building has his computer connected to a separate ethernet jack.

As far as I know our two computers are not within a LAN, and ipconfig shows that we only have external ip addresses.

The problem, then, appears when we attempt make direct communication between our computers. I have some hosting server set up on my machine, and my friend is unable to connect to it via my ip address. Other people who do not live in the apartment can connect fine.

Ethernet adapter Local Area Connection:

   IPv4 Address. . . . . . . . . . . : 204.29.113.41
   Subnet Mask . . . . . . . . . . . : 255.255.254.0
   Default Gateway . . . . . . . . . : 204.29.112.1

His ip: 204.29.113.104

Using a fulltunnel vpn doesn't help.