Re: network broken after kernel upgrade

From: Tauno Voipio (
Date: 06/21/05

Date: Tue, 21 Jun 2005 07:04:29 GMT

Eggert Ehmke wrote:
> I screwed up my rootserver. It was running fine with Debian Sarge, kernel
> 2.4.26. I wanted the 2.6 kernel, so I installed kernel-image-2.6.8-2-868
> and module-init-tools. I put the new boot option as default in lilo.conf
> and also added the initrd line. Run lilo, all looked fine. After reboot, I
> had no access to the server anymore.
> No problem, I thought, booted the remote recue system, mounted the
> partitions and proc, chrooted into the system and put the old kernel as
> default again. Reran lilo, unmounted partitions and rebooted again. This is
> where the pain began: still no network access! When I look into kern.log,
> it seems that the network driver is loaded ok, but eth0 never gets an ip
> address. /etc/network/interfaces is ok too and was not changed in the
> process.
> I can still reboot into the rescue system. Any ideas?

If the network interface is supposed to get the setup
by DHCP, have a look at /var/log/daemon.log.

What do following commands report:

   ifconfig -a
   route -n

Do you have a firewall (ipchains / iptables)? Can
it be blocking the network traffic?

Is DNS set up properly? See /etc/resolv.conf.


Tauno Voipio
tauno voipio (at) iki fi