ifconfig lo0 question, ultrix32 1.2

[ramey@ti-csl]

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.

Joe Ramey
TI Computer Science Center, Dallas
CSNET: ramey@ti-csl
UUCP: {rice,ut-sally!im4u,texsun}!ti-csl!ramey

[Dick Dramstad]

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 (r...@mitre-bedford.arpa)