Re: [Qemu-devel] using -net dump with tap networking

[Laszlo Ersek]

On 02/19/13 09:53, Markus Armbruster wrote:
> Stefan Hajnoczi <address@hidden> writes:
> 
>> On Tue, Feb 19, 2013 at 12:37:28PM +1100, Alexey Kardashevskiy wrote:
>>> On 14/02/13 21:26, Stefan Hajnoczi wrote:
>>>
>>>>>>> Now I want to enable network dump. With the old "-net" syntax I could do
>>>>>>> that with "-net dump" but I cannot with the new syntax, tried many
>>>>>>> variants, none works. What would the correct syntax be for the case 
>>>>>>> above?
>>>
>>> The question was about new "-netdev" interface.
>>>
>>>> I would do:
>>>>
>>>> qemu-system-ppc64 ...
>>>>       -net tap,ifname=tap0,script=qemu-ifup.sh
>>>>       -net nic,model=virtio
>>>>       -net dump,file=./dump.lan.qemu.virtio
>>>>
>>>
>>> The answer is about old "-net" interface which I know how to use.
>>>
>>> Does this mean that there is no way to use "dump" with "-netdev tap"?
>>
>> It is not possible using just -netdev/-device.  The closest you can get
>> is:
>>
>>   $ qemu -netdev hubport,hubid=1,id=hubport0 \
>>          -device virtio-net-pci,netdev=hubport0,... \
>>       -net tap,vlan=1,... \
>>       -net dump,vlan=1,...
> 
> Care to explain briefly how hubport works, and how it's connected to the
> legacy "vlan" feature?

This is the v2 blurb:

http://thread.gmane.org/gmane.comp.emulators.qemu/161502

A so called "diagram":

http://article.gmane.org/gmane.comp.emulators.qemu/161245

Laszlo