a couple of possibilities:
1) You may require a crossover cable if your network does not have a hub/router of some description (in the case of RJ45 cable).

2) Why not have a look at some freeware HTTP server software, ie- HTTPD, Apache, NCSA Server Daemon, etc.
This will enable you to create an IP situation; or

3) Build a OS/2 Warp 4 box as a router as the software is included in the OS.

Regards,

David Morrison-Gardiner
DMG Consulting
(ardent OS/2 User)