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

Avi Kivity
2009-10-26T13:44:52Z

On 10/26/2009 03:40 PM, Krumme, Chris wrote:
>
>> Well, it is. vlan=x really means "the ethernet segment named x". If
>> you connect all your guest nics to one vlan, you are
>> connecting them all
>> to one ethernet segment, so any packet transmitted on one will be
>> reflected on others.
>>
>> Whether this is a useful feature is another matter, but the code is
>> functioning as expected.
>>
> Hello,
>
> We had one environment where the NIC understood by u-boot and the NIC
> understood by the kernel where different. We just attached both to the
> same VLAN. During u-boot one was used for downloading the kernel, then
> once the kernel booted the other was used. Not ideal, and maybe not
> important enough to keep the "feature" around, but it does get used now
> and again.
>

You could get the same behaviour by using two different vlans connected
to the same bridge.

--
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