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[Qemu-devel] multiple VM on one tap device

From: Kирилл Паленов
Subject: [Qemu-devel] multiple VM on one tap device
Date: Thu, 13 Dec 2007 19:57:18 +0300

Hello all.
Is it possible run several VM connected with one tap device?
I tried to run two VM with allready exist tap0 but when I started second I've got message: "warning: could not configure /dev/net/tun: no virtual network emulation Could not initialize device 'tap' ".
I did following under root:

-bash-3.00# tunctl -b -t tap0
-bash-3.00# ifconfig tap0 netmask up
-bash-3.00# ifconfig tap0
tap0      Link encap:Ethernet  HWaddr 00:FF:A1:81:05:B0
          inet addr:  Bcast:  Mask:
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

Then started VM with following parameters:

1. -net nic,macaddr=00:1a:4b:34:74:43 -net tap,vlan=0,ifname=tap0,host=sv3,script=no
2. -net nic,macaddr=00:1a:4b:34:74:44 -net tap,vlan=0,ifname=tap0,host=sv4,script=no

I did it under linux kernel

What does it mean fd in -net tap,fd ?  File discriptor of /dev/net/tun  or  tap device.

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