Network AD7D16 is connected also with NetWare server, which has node number 60971D0C76. NetWare server acts as router to two another network segments with numbers 339E081C and 88888. Routing table don't say anything about networks 339E081C and 88888. They can be for example another network segments, connected to NetWare server by another network cards. If then IPX will work, you probably have just same problem I had long time and which is solved with workaround.
Solution is described just below.
With only IPX allowed on client side IPX over PPP worked well. Hartwig Felger sent me letter with workaround . That's Linux 2.0.x problem, solved with 2.1.x and 2.2.x kernels. Considerable part of this letter is in German, so I try to explain shortly, what it make. If not, IPX layer isn't up yet and all is OK, nothing more to do.