Gossamer: I've got it working great.
Here's what I did:
1) Download the IPXWrapper ->
http://www.solemnwarning.net/ipxwrapper/
2) Extract the contents into which ever game you playing (It should ask you to overwrite wsock32.dll, if it didn't, you didn't put it in the right place. Click yes to replace it)
- Carmageddon (example: E:\Games\Carmageddon\CARMA)
- Splat Pack (example: E:\Games\Carmageddon\CARSPLAT)
3) Go to which ever location you extracted it to and run ipxconfig.exe
4) Primary interface should be selected as whatever network device you are using. Then click on that same device under "Network adapters". Make sure that "Enable interface" is checked and apply the settings.
5) run ipxrouter.exe (This has to be run before the game)
6) Start carmageddon and multiplayer should be functioning.
I've done this and now my roommate and I are both playing the windows 95 version of both Carmageddon and Splat pack via multiplayer. We're going to attempt to play it over tunngle with some of our friends online to see how well that works.