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QEMU vde Notes Revisited

July 10th, 2007

It is happening again... so here are lots of lots of notes on setting up QEMU, VDE, FreeBSD, Debian, tun/tap.

QEMU direct to a host bridge via tap0 only allows for one guest per tunnel. That's no good! We want vdeswitch to connect to tap0, and for QEMU guests to connect to vdeswitch.

Don't forget:

mknod /dev/kqemu c 250 0

chmod 666 /dev/kqemu

Here's some updated QEMU notes:

  1. vde_switch -tap tap0 -daemon
  2. ifconfig tap0 up
  3. brctl addif br0 tap0
  4. sudo vdeqemu -m 512 -vnc :2 -net nic,macaddr=00:11:22:ee:ff:44 -net vde deb4vde.raw &

NOTE: You will have to come up with unique mac addresses for each virtual machine you attach to the vde switch!

Here is a new entry on the network when I do an nmap scan:

Host 192.168.0.188 appears to be up.
MAC Address: 52:54:00:12:34:56 (QEMU virtual NIC)

Also, I still need to put the follow in /etc/qemu-ifup:

#!/bin/sh
echo "Executing /etc/qemu-ifup"
echo "Bringing up $1 for bridged mode..."
sudo /sbin/ifconfig $1 0.0.0.0 promisc up
echo "Adding $1 to br0..."
sudo /usr/sbin/brctl addif br0 $1
sleep 2

On FreeBSD: kldload if_bridge ifconfig bridge create ifconfig bridge0 addm sis0 addm tap0 up

vdeqemu -vnc :1 -net nic,macaddr=12:43:12:12:23:32 -net nic,vlan=3 \ -net vde /usr/jail/root/m0n0jab/work/image.bin

Make sure to use the VLAN tag otherwise you'll get some serious broadcast storms.

Related:

http://lists.debian.org/debian-user/2006/01/msg01598.html

http://compsoc.dur.ac.uk/~djw/qemu.html QEMU - Debian - Linux - TUN/TAP - network bridge

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