Re: Help with Ubuntu + bridge + tap + qemu + Windows

[David Logan <djlogan2.dl@xxxxxxxxx>]

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@xxxxxxxxxxxxxxxxxx> wrote:

On Mon, 1 Feb 2016 13:04:48 -0700
David Logan <djlogan2.dl@xxxxxxxxx> 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.