IPX multiplayer gaming in dosemu

I did some testing with multiplayer games under dosemu. With IPX networking, there were some serious issues that I was unable to solve. This is a list of the tested games and the test results I got:

Carmageddon, Warcraft 2 (original), Death Rally: IPX multiplaying seems to work first, but servers are invisible to other players. (All these games are somewhat similar in starting a multiplayer game - I wonder if this has something to do with it?)

Grand Theft Auto, Transport Tycoon Deluxe, Quake: IPX multiplaying works but lags too much to be playable :(

Duke3d: Something wicked happened after starting to the game host, and other players could do nothing.

Ultimate Tapan Kaikki (freeware, downloadable at least from http://www.acid-play.com/download/Ultimate_Tapan_Kaikki.php): Crashes with dos4gw division by zero error when starting multiplayer. Could be a problem with the game, though...

I could get all of them work in single player mode quite perfectly (although sound is a bit problematic with some), and multiplayer is proven to work under native MS-DOS (and Win9x). But has somebody had any success in dosemu IPX multiplaying with these (or any other games)? Do I possibly need to load some DOS network drivers in addition to dosemu IPX support?

Parts of my configuration that supposedly are relevant:

Module ipx loaded

$ ifconfig
          ...
          IPX/Ethernet 802.2 addr:0008C7FAFB49
          ...

.dosemurc: $_ipxsupport = (on)

Running xdosemu as root

-Eemeli

Forgot to mention: dosemu 1.3.0, kernel 2.6.0-test9