[Qemu-devel] Using tap device for qemu

[Gayathri Nagarajan]

I have a problem with networking in qemu. I want to use the Linux tap device for qemu network. For that

1. I created a bridge -

$ sudo brctl addbr br0 

2. I used the following qemu-ifup script

#!/bin/sh
set -x

switch=br0

if [ -n "$1" ];then
        /usr/bin/sudo /usr/sbin/tunctl -u `whoami` -t $1
        /usr/bin/sudo /sbin/ip link set $1 up
        sleep 0.5s
        /usr/bin/sudo /usr/sbin/brctl addif $switch $1
        exit 0
else
        echo "Error: no interface specified"
        exit 1
fi

3. When I run qemu using

$ qemu-system-i386 -m 200M -cdrom images/ss.iso -serial stdio -device e1000,netdev=net0,mac=DE:AD:BE:EF:00:C0 -netdev tap,id=net0,script=/home/user/qemu-ifup

/home/user/qemu-ifup:could not launch network script

qemu-system-i386: -netdev tap,id=net0,script=/home/user/qemu-ifup: Device 'tap' could not be initialized

How do I resolve this problem?

Thank you

gayathri