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Old 08-20-2009, 11:58 AM   #1
bubnoff
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Registered: Jun 2009
Location: Northwest
Distribution: Slackware
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Ubuntu 9.04 loses network connection after reboot.


As the title suggests ~ some of the 100+ Ubuntu 9.04 workstations
we manage lose their network connection after rebooting (which they do nightly to pick up updates, install kernel upgrades etc. ). It is rare and intermittent. Since we have lot's of them though, it happens maybe 2 - 5 times per week across all of our locations.

I've seen the bug for 9.04's NetworkManager, which overwrites the
resolv.conf settings. This does not appear to be the case here, though it
has happened. The settings I've put in /etc/network/interfaces are retained as are the /etc/resolv.conf settings.

My question is ~ How would you go about troubleshooting this?
e.g. ~
Which logs?
If dmesg, then what would you look for?

Limitations: I have only remote access (ssh) to these machines and so do not have access while offline. They DO come back after a reboot and then I can check logs and whatnot. There are no on site technicians. I have them reboot the station and usually it returns from the dead. It seems to
not be affected by hardware as we have many different setups, so I think it's specific to 9.04 or possibly a customization done to the bootup scripts.

Thanks ~

Bub
 
Old 08-20-2009, 04:29 PM   #2
markush
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Registered: Apr 2007
Location: Germany
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Hello bubnoff,
Quote:
some of the 100+ Ubuntu 9.04 workstations
we manage lose their network connection after rebooting
I'd suggest to log the network-configuration after every reboot. With a script you can pipe the output of /sbin/ifconfig (for example) in a logfile. I would at first try to log the settings/configurations which I look at when I have access to a machine which seems not to be connected to the network.
When you use DHCP, and "ifconfig" does not show a proper configuration after a reboot, it would be interesting to take a capture of the DHCP-network-traffic while the machines are rebooting.

Markus
 
Old 08-20-2009, 07:29 PM   #3
bubnoff
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Registered: Jun 2009
Location: Northwest
Distribution: Slackware
Posts: 43

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I'll give that a shot.

Thanks ~

Bub
 
  


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