Setting up a Sun as a router

[Daniel Geist]

I am trying to set up my sun as a router without much success. I have an
extra Ethernet card and I can talk to both my networks. But no machine on
one side can talk to a machine on the other side. I seems like my sun does
not pass packets between sides. I have for each side two different class B
numbers i.e 128.252.123.xxx and 128.252.145.xxx. If anyone has done this
before I need your help I seem to be missing something.