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Re: [Qemu-devel] net packet storms with multiple NICs

From: Michael Tokarev
Subject: Re: [Qemu-devel] net packet storms with multiple NICs
Date: Wed, 11 Nov 2009 12:23:01 +0300
User-agent: Mozilla-Thunderbird (X11/20090706)

Paul Brook wrote:
I immediately reproduced the problem locally.  It turns out that
kvm reflects packets coming from one guest NIC on another guest
NIC, and since both are connected to the same bridge we're getting
endless packet storm.  To a level when kvm process becomes 100%
busy and does not respond to anything but `kill -9'.

You created a network loop. It is working exactly as expected.
Create the same topology with a physical network hub and a pair of NICs and you'll get the same end result.

Paul, I know what the result is.  But mind you, I talked about something
different, namely: why, using "obvious" way, you get a packet storm/loop
instead of a working network.  And if that loop is useful in the first

I've got answers to both already :)



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