Ethernet bridging weirdness

[Douglas Stanley]

On Tue, Sep 14, 2010 at 3:50 PM, Sebastien Estienne
<sebastien.estienne at gmail.com> wrote:
> swap the hard drives, so you ll see if it a software issue or hardware
>

Ok, this didn't really work. I realized after I swapped drives, that
the udev persistent net rules would be all wrong. BUT, after swapping
drives, both machines had both a br0 and a br1 bridge, although listed
with no ports attached. But just the fact that the bridge came up fine
when it couldn't find eth2 atleast tells me something. Not sure what
it tells me, but it tells me something.

I also tried swapping out the plugs to the upstream switch, thinking
maybe the two switchports that both machines' eth2 ports were
connected to was causing it, but the both worked the same regardless.

> --
> Sebastien E.
>
>
> Le 14 sept. 2010 à 21:29, Douglas Stanley <douglas.m.stanley at gmail.com> a écrit :
>
>> 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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>



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