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From: Archie Cobbs <archie@whistle.com>
Message-Id: <199705222331.QAA09008@bubba.whistle.com>
Subject: rtinit: wrong ifa
To: freebsd-hackers@freebsd.org
Date: Thu, 22 May 1997 16:31:20 -0700 (PDT)
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I have a fairly recent RELENG_2_2 kernel. Suppose I want to number
interfaces "lo1" and "ed0" like this:

  lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
	  inet 207.76.205.82 netmask 0xffffffff 
  ed0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	  inet 207.76.205.82 netmask 0xffffff00 broadcast 207.76.205.255
	  ether 00:60:61:01:03:ec 

Huh? You want to know why the heck I'm doing this?? OK... :-)

The problem I'm trying to solve is that I want the address 207.76.205.82
to always exist on *some* interface, because I've got services binding
to it explicitly (as opposed to INADDR_ANY) -- but the "ed0" interface
may be going up or down.

Remember that point to point interfaces gladly allow the local address
to exist on another interface as well. This is the desired effect...

Some questions..

  Question #1:	Should this be allowed?

  Question #2:	Does FreeBSD allow this? It seems to work...

  Question #3:	Why does the following message appear on the console
		after ifconfig'ing lo1?

		    rtinit: wrong ifa (0xf083b700) was (0xf07e7580)

  Question #4:	Is it anything to worry about?

Thanks,
-Archie

___________________________________________________________________________
Archie Cobbs   *   Whistle Communications, Inc.  *   http://www.whistle.com