Ethernet bridging weirdness

[Douglas Stanley]

On Tue, Sep 14, 2010 at 4:10 PM, Imre Gergely <gimre at narancs.net> wrote:
>
> Take a look at /etc/udev/rules.d/70-persistent-net.rules file, maybe there's
> the funkiness (or funkyness?).
> Also, where is eth1 ? I'm not saying it matters know it shouldn't matter but
> still. Is there a NetworkManager that could mess things up ?
>

Nothing was out of the ordinary with that. It was one of the first
things I looked into when the problems started.


> On 09/14/2010 10:29 PM, Douglas Stanley wrote:
>>
>> Hello all,
>>
>> I'm about at my wit's end, and I really hope some one might be able to
>> shed some light on this topic for me.
>>
>> I have two physically identical servers, both running 10.04.1, both
>> are completely up to date. Both are set up to be kvm hosts. On both
>> machines, I have an IDENTICAL /etc/network/interfaces, the only
>> difference being two lines where ip addresses are specified.
>>
>> The problem is, that both machines need a bridge set up on boot, so
>> that virtual machines can access it. One machine works 100% fine, the
>> other, the second bridge never comes up!
>>
>> My /etc/network/interfaces file can be seen at:
>> http://gist.github.com/579592
>>
>> Also, I just did a fresh re-install of 10.04.1, and performed the
>> updates on the machine that isn't working, thinking that maybe I did
>> something slightly different during the initial install. But it still
>> doesn't work.
>>
>> If I type:
>> sudo ifup br1
>> I get: "ifup: interface br1 already configured". But, ifconfig doesn't
>> list either my eth2 or my br1 devices. Also, brctl show doesn't list
>> my second bridge. But, if I edit /var/run/network/ifstate and remove
>> the br1=br1 line, then run "sudo ifup br1", it comes up just fine.
>> Similarly, if I "sudo ifdown br1;sudo ifup br1" that also works.
>>
>> Any idea why it isn't coming up automatically on boot, when my other
>> identical machine does just fine? Or even where I might look to try
>> and figure it out myself? There are no error messages in any of the
>> log files that I could find. I'm truly stumped!
>>
>> Thanks,
>> Doug
>>
>
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> Imre Gergely
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