Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!purdue!bu-cs!encore!xylogics!loverso
From: loverso@Xylogics.COM (John Robert LoVerso)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: IP address per host vs. per interface (was: Re: Super Cheap IP router)
Message-ID: <994@xenna.Xylogics.COM>
Date: 9 Apr 89 03:09:53 GMT
References: <583@accuvax.nwu.edu.NWU.EDU> <1989Apr4.000727.2759@utzoo.uucp> <25098@amdcad.AMD.COM> <15134@bellcore.bellcore.com> <424@mahendo.Jpl.Nasa.Gov>
Reply-To: loverso@xenna.UUCP (John Robert LoVerso)
Organization: Xylogics, Inc., Burlington MA
Lines: 18

In article <424@mahendo.Jpl.Nasa.Gov> poseur!earle@Sun.COM writes:
> ... and I also just discovered an Encore Annex terminal server that
> gives the same IP address to it's Ethernet interface, and to a permanently-
> attached SLIP interface...

This isn't really something special about the Annex; the ability to give
multiple interfaces the same IP address is inherited from the 4.3BSD
networking code, and any BSD-based host should be able to do the same
thing.  The one special thing the Annex does is respond to ARP requests
for the SLIP destination address, if its network number is the same as
the one on the Annex's Ethernet interface.  This makes it convenient for
connecting isolated hosts, as no additional routing information is needed
(as you've discovered).

-- 
John Robert LoVerso			Xylogics, Inc.  617/272-8140
loverso%Xylogics@Encore.COM		Annex Terminal Server Development Group
encore!xylogics!loverso			[formerly of Encore Computer Corp]