mars-nwe included old /etc/nwserv.conf file. Better will be to include new one, which could be find in /usr/doc/mars-nwe-???/nw.ini. You could also change SYS entry to point to better dir. Also ifup-ipx in /etc/sysconfig/network-script is buggy, so it doesn't care that ipx_interface rezides in /sbin, not in /usr/bin. I patched it, and could send patch if required.
Created attachment 151 [details] patched ifup-ipx
ifup-ipx has been fixed as of the 6.1 errata initscripts.
and the newer config file is in mars-nwe-0.99pl17-8, in rawhide...