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From: mouse@mcgill-vision.UUCP (der Mouse)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: ethernet interface perversity
Message-ID: <862@mcgill-vision.UUCP>
Date: Sat, 15-Aug-87 01:09:53 EDT
Article-I.D.: mcgill-v.862
Posted: Sat Aug 15 01:09:53 1987
Date-Received: Wed, 26-Aug-87 06:17:48 EDT
References: <8708050046.AA07011@ucbvax.Berkeley.EDU>
Organization: McGill University, Montreal
Lines: 22

In article <8708050046.AA07011@ucbvax.Berkeley.EDU>, JOHNSON@NUHUB.ACS.NORTHEASTERN.EDU ("I am only an egg.") writes:
> We did some experimentation with our various ethernet interfaces and
> discovered that something which was hinted at in many of the
> responses seems to be true.  The ethernet interfaces we have will
> each respond to only one internet number at a time.

If this is so it is a software problem.  I can see no reason why UNIX
(say) couldn't be set up to respond to ARP requests for more than one
IP address per interface.  The reason you need a gateway node is that
the software is not currently set up to do this, and thus you need
either a gateway or some serious low-level network code hacking to
allow multiple IP addresses per interface, or alternatively multiple
pseudo-interfaces which all send their packets out on the same physical
interface.

In other words - yes, it will work to have multiple IP networks on the
same cable.  However, you need either a gateway or some
currently-nonexistent software.

					der Mouse

				(mouse@mcgill-vision.uucp)