Re: resolv.conf getting erased

[tyler <tyler.smith@mail.mcgill.ca>]

tyler <tyler.smith@mail.mcgill.ca> writes:

> Thanks for all the tips, on and off-list. I noticed that at the same
> time as my resolv.conf was getting cleared, something was bringing up
> the eth0 interface. After much poking and prodding, I found that
> commenting out the allow-hotplug lines associated with eth0 in my
> /etc/network/interfaces, ie:
>
>   # The primary network interface
>   # allow-hotplug eth0
>   # iface eth0 inet dhcp
>
> seems to have solved the problem. This is something I was messing with
> months ago, and I have no idea why (or if!) the associated behaviour
> changed now. Anyways, things seem to be working fine now. We'll see what
> happens when I plug into eth0 at work tomorrow.
>

I've been working at home all week, just plugged into my work eth0. On
resuming from hibernate to disk, only the lo interface was up. I plugged
in the ethernet cable and called ifconfig eth0 up. The eth0 network was
up, without an IP, and I also had an entry for eth0:avahi:

eth0:avahi Link encap:Ethernet  HWaddr 00:16:d3:29:0d:aa  
          inet addr:169.254.5.190  Bcast:169.254.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:16 

I then called dhclient eth0, and got an IP on eth0. Everything then
seemed to be working, but dns lookups were slow. So I checked
resolv.conf, and this time, instead of being cleared of all useful info,
it had the dns servers for my work network *and* my home router:

tyler:~-> cat /etc/resolvconf/run/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.2.1
nameserver 140.184.1.21
nameserver 140.184.1.22
search no-domain-set.aliant SMUNET.SMU.CA

So now I've got the opposite problem as before - instead of having
resolv.conf properly updated, I'm getting the new info appended. Which
means I still have to edit the file by hand. Any ideas what's wrong
would be most helpful!

I will eventually look into automating more of this, but I would like to
understand what's going on at a lower level, hence my current efforts to
sort this out at with dhclient and ifconfig.

Cheers,

Tyler

-- 
I never loan my books, for people never return them. The only books
remaining in my library are those I’ve borrowed from others.
                                       --unknown