1. connection:
nt4-client with 3com fast ehterlink xl pci
via cross-cable to on-board ibm ethernet-adapter in nt4-server.
no problems so far.

2. connection:
from the same nt4-server via realtek-8019 pnp
ethernet adapter (media: 10base-2) to the same adapter in win95-client.

the realtek-8019 adapter is installed as dhcp- and dns-server. supplied test-sw for adapters shows green on both ends. no erros-msgs on nt4-server, but logon on win95-client results in error msg:
no domain server available ...

any suggestions/solutions?