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From: rad@mitre-bedford.arpa (Dick Dramstad)
Newsgroups: net.unix-wizards
Subject: Re: ifconfig lo0 question, ultrix32 1.2
Message-ID: <3828@brl-smoke.ARPA>
Date: Mon, 15-Sep-86 16:34:19 EDT
Article-I.D.: brl-smok.3828
Posted: Mon Sep 15 16:34:19 1986
Date-Received: Tue, 16-Sep-86 20:25:21 EDT
Sender: news@brl-smoke.ARPA
Lines: 26

Joe,

>We have 2 780's running Ultrix.  One runs version 1.1, the other we
>just installed with 1.2.  On the 1.2 host, syslog doesn't work.  The
>only difference I could tell between the two systems is that when I do
>`/etc/ifconfig lo0', the 1.1 system gives the flags UP,RUNNING but the
>1.2 system only says UP.  I recompiled syslog using 1.1 sources and the
>perror message was `Network is unreachable'.

>Any ideas what is wrong?  The fact that the RUNNING flag is not present
>apparently makes lo0 unusable; telnets to localhost apparently go over
>the ethernet rather than through the loopback, for example.

     We had the same problem on our 8600.  What was worse, all our
syslog entries ended up being sent to a default routing host, which
was elsewhere on the ARPAnet.  We finally found the problem after
looking at the default /etc/rc.local file supplied with the distro.
You'll need to use:

	/etc/ifconfig lo0 localhost

to cure your problem.  I don't know the "why" for this fix; I suppose
it's some Ultrix-specific 1.1->1.2 change.  

Hope this helps,
Dick Dramstad (rad@mitre-bedford.arpa)