[Bridge] Help with Ubuntu + bridge + tap + qemu + Windows

[David Logan]

That was a bit above my head. Can you elaborate or point me towards a web site that explains the terminology? Sorry, I’m reasonable at networking, I know what levels are, I have an idea of what the various fields and stuff are, but I am no means an expert :)

Also: While I have STP enabled at the moment as the recommendation of one web site, most of the time STP has been disabled in the bridge. I can turn it off and/or reboot and replicate the problem in minutes. Does that alter your suggestion?

David Logan


> On Feb 1, 2016, at 8:27 PM, Stephen Hemminger <stephen at networkplumber.org> wrote:
> 
> On Mon, 1 Feb 2016 13:04:48 -0700
> David Logan <djlogan2.dl at gmail.com> wrote:
> 
>> oops. Wrong machine. The uname -a really is
>> 
>> Linux server2 3.16.0-59-generic #79~14.04.1-Ubuntu SMP Mon Jan 18 15:41:27 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>> 
>> David Logan
>> 
>> 
> 
> I suspect you have a loop and STP is detecting that the STP packets being sent
> out one of the ports on the bridge are showing back up on another port on the bridge.
> 
> The way bridging works you need to make each port on the bridge is a separate L2 domain;
> otherwise you create a loop.

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