Date: Fri, 21 Aug 2009 15:30:42 +0200 From: martinko <gamato@users.sf.net> To: freebsd-emulation@freebsd.org Subject: Automagic bridged networking with QEMU (tap) Message-ID: <h6m7i2$pgt$1@ger.gmane.org>
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Hallo list,
I spent a good portion of yesterday trying to find out how to change
from using user mode to bridged networking with QEMU on FreeBSD 7.2.
As I found a few how-to's of differing quality and I couldn't manage to
make it work for some time, I decided to share the final results of my
journey with you as I believe it may save someone a few hours or hair.
The proposed solution does not need any manual steps and is fully
transparent to users (like user mode networking is). It does not even
permanently bridge your real NIC, only when necessary, which is good
because of some performance penalties when bridging. And you can run as
many guests as you want and it's all set up automagically. :-)
OK, enough words, here's what to do:
/boot/loader.conf[.local]:
if_bridge_load="YES"
if_tap_load="YES"
/etc/sysctl.conf:
net.link.tap.up_on_open=1
net.link.tap.user_open=1
/etc/devfs.rules:
[localrules=10]
add path 'tap*' mode 0660
/etc/rc.conf[.local]:
devfs_system_ruleset="localrules"
kqemu_enable="YES"
/usr/local/etc/qemu-ifup -- custom script
/usr/local/etc/qemu-ifdown -- custom script
--- /usr/local/etc/qemu-ifup
#!/bin/sh
#
# /usr/local/etc/qemu-ifup : martinko [20-aug-2009]
#
IFNAME=re0
for BRIDGE in $(ifconfig -a | grep '^bridge' | cut -d: -f1)
do
if [ -n "$(ifconfig "$BRIDGE" | grep -w "member: $IFNAME")" ]
then
echo "${0##*/}: Adding $1 as a member of $BRIDGE"
sudo /sbin/ifconfig "$BRIDGE" addm "$1" up
exit
fi
done
BRIDGE="$(sudo /sbin/ifconfig bridge create)"
sudo /sbin/ifconfig "$BRIDGE" addm "$IFNAME" addm "$1" up
echo "${0##*/}: Created $BRIDGE and added $1 as a member"
--- /usr/local/etc/qemu-ifdown
#!/bin/sh
#
# /usr/local/etc/qemu-ifdown : martinko [20-aug-2009]
#
for BRIDGE in $(ifconfig -a | grep '^bridge' | cut -d: -f1)
do
if [ -n "$(ifconfig "$BRIDGE" | grep -w "member: $1")" ]
then
if [ "$(ifconfig "$BRIDGE" | grep -c -w "member:")" -le 2 ]
then
echo "${0##*/}: Destroying $BRIDGE"
sudo /sbin/ifconfig "$BRIDGE" destroy
fi
echo "${0##*/}: Destroying $1"
sudo /sbin/ifconfig "$1" destroy
fi
done
---
And that's all, folks! :)
Enjoy and if you find a better solution please let me/us know.
Cheers,
Martin
PS1: Of course change IFNAME in qemu-ifup according to your setup.
PS2: You man want/need to change the group in devfs.rules as well.
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