How do I set up an insulating gateway?

Sat Oct 7 08:27:27 AEST 1989

If I have a 4.3bsd (or 4.3-tahoe) machine with two IP interfaces, is there any
way to prevent packets from one net reaching the other?  I want the machine to
be able to talk to either net, but nobody else should be able to use it as an
IP gateway.  I can't think of any obvious way of doing this.

 -Guy Middleton, University of Waterloo		gamiddleton at watmath.waterloo.edu
		(+1 519 885 1211 x3472)		gamiddleton at watmath.uwaterloo.ca