Jacked network bridges

Kenny Long long.kenny at gmail.com
Sun Jan 29 04:44:56 MST 2012


Gabe,

I suggest reviewing the output of brctl showmacs brX after attempting
communications.  For network B are all of respective  guests MAC addresses
there?

On Jan 29, 2012 2:26 AM, "Gabriel Gunderson" <gabe at gundy.org> wrote:
>
> On Sat, Jan 28, 2012 at 11:03 PM, Tod Hansmann <plug.org at todandlorna.com>
wrote:
> > I'm guessing this has to do with VLAN tagging, and I'm not entirely sure
> > how all that works in virtual hosts let alone kvm/libvirt which I've
> > never used thus far.  The VLAN tagging could be working on Set X
> > specifically because it has the 3rd interface.  I don't know what that
> > 3rd interface translates into on the wire, and on which of the 3 host's
> > wires, but it's probably more telling than you're giving it credit for.
>
> I don't know... when pinging from a virt guest that works to another
> that doesn't, the packets shouldn't even hit the switch. Everything is
> untagged until then. More ascii flowcharting follows:
>
> virt-guest-x NIC => virt-host NIC => bridge-x => virt-host NIC
virt-guest-x NIC
>
> So, no CAT5, VLAN or switch in that case. Just the bridge and virtual
> interfaces.
>
>
> > Sorry I don't have more specific ideas on this.  I'm kind of hoping a
> > sounding board effect will be beneficial for you here, as your situation
> > is very specific.  Call me if you want to keep bouncing ideas back and
> > forth.
>
> You're kind to offer; if it gets bad, I just might :)
>
>
> Best,
> Gabe
>
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