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Date: Tue, 8 Jun 2010 16:14:38 +0300
From: "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] configure: add an option to disable vlans
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Paul Brook <paul@codesourcery.com>, qemu-devel@nongnu.org

On Tue, Jun 08, 2010 at 08:02:27AM -0500, Anthony Liguori wrote:
> On 06/08/2010 06:09 AM, Michael S. Tsirkin wrote:
>> On Mon, Jun 07, 2010 at 03:40:57PM -0500, Anthony Liguori wrote:
>>    
>>> On 06/07/2010 02:21 PM, Michael S. Tsirkin wrote:
>>>      
>>>> So I see two ways to go forward: switch default value in my patch,
>>>> or disable vlans unconditionally.
>>>>
>>>>        
>>> The problem with disabling vlans unconditionally is that you break -net
>>> socket and -net dump.
>>>      
>> -netdev socket seems to be supported. No?
>>    
>
> Sure, but it's of limited utility in the absence of vlans.  A typical  
> thing to do with -net socket would be to launch one instance of qemu  
> with -net user, -net socket, and -net nic.  Another qemu would be  
> launched with -net socket and -net nic connected to the previous  
> instance.  Now you've got a working virtual network with external access.

Only terribly slow, esp when tunneling tcp over tcp.

> -netdev socket alone won't get you this.

-socket should really support udp. Then you could get what you
wanted with halfway decent speed using multicast.

> Regards,
>
> Anthony Liguori