From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Kiszka <jan.kiszka@siemens.com>
Subject: Re: User mode network cause other network doesn't work any more
Date: Fri, 02 Sep 2011 16:42:48 +0200
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Cc: kvm@vger.kernel.org
To: Liang Guo <bluestonechina@gmail.com>
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On 2011-09-02 15:59, Liang Guo wrote:
> Hi,
> 
> When I run kvm with following option:
> 
>          -net nic -net vde,sock=/var/run/vde2/vde3.ctl
> 
> the guest OS's network work as expected, I can ping/ssh from/to host OS,
> but when I run kvm with:
> 
>         -net nic -net user -net nic -net vde,sock=/var/run/vde2/vde3.ctl

That's probably the classic mistake: You create one virtual LAN inside
QEMU this way. Attached to this LAN are all four peers (two NICs, slirp
and VDE).

What you likely want are two backend/frontend pairs:
-net nic,netdev=net1 -net user,id=net1 \
-net nic,netdev=net2 -net vde,sock=/var/run/vde2/vde3.ctl,id=net2

Jan

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