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From: forys@sigi.Colorado.EDU (Jeff Forys)
Newsgroups: comp.unix.wizards
Subject: Re: rwho problems between 4.2 and 4.3 hosts
Message-ID: <1158@sigi.Colorado.EDU>
Date: Mon, 25-May-87 21:28:22 EDT
Article-I.D.: sigi.1158
Posted: Mon May 25 21:28:22 1987
Date-Received: Tue, 26-May-87 04:36:30 EDT
References: <7523@brl-adm.ARPA> <12249@topaz.rutgers.edu>
Reply-To: forys@boulder.Colorado.EDU (Jeff Forys)
Distribution: world
Organization: University of Colorado, Boulder
Lines: 17
Keywords: gateway, ifconfig, broadcast

In article <12249@topaz.rutgers.edu> hedrick@topaz.rutgers.edu
(Charles Hedrick) writes:
> However you can set the broadcast address in 4.3 using ifconfig.
> Reasonable things to try are 128.x.0.0 and 0.0.0.0 [...]

From what I've determined, this causes a problem iff the machine is
a gateway on a class B net where only the subnet addr is different.
Given an address of `128.net.0.0', and two interfaces `128.net.sub1'
and `128.net.sub2', it cant decide which one to use, and broadcast
packets never get out.  Packets get out if you set the broadcast
address to `128.net.sub.{0,1}', leaving a nasty kernel hack as the
only way to get `128.net.0.0' out of a gateway.

Can anyone confirm/deny the above behavior?
---
Jeff Forys @ UC/Boulder Engineering Research Comp Cntr (303-492-6096)
forys@Boulder.Colorado.EDU  -or-  ..!{hao|nbires}!boulder!forys