Need help with DS5000 ris install

[Dave Wortman]

I'm trying to use /etc/ris to network install Ultrix 4.0 on a new
DS5000/200PX.  Network connection is via the optional thick ethernet
adapter (no thin ether in these parts).  I can boot the standalone
vmunix and start the advanced installation procedure ok.
The install fails when the install.1 script tries to use rsh to
extract information from my server (a 3600 Ultrix system).
It consistently gets the "Connection timed out" error.
Essential files on each side seem to be ok (e.g /etc/hosts on DS5000
has valid server/client entries. server setup has been checked).
When the installation fails, the system goes into standalone single
user mode.  In that mode, all attempts to rsh the server fail
with connection time outs.

Conjecture is that the standalone vmunix doesn't understand the
thick ethernet port and is trying to use the null terminated 
thin ethernet.  There doesn't appear to be any easy way to
ifconfig the ports correctly.

SUGGESTIONS APPRECIATED