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Date: Tue, 10 Mar 2015 14:32:59 +0800
From: Shannon Zhao <zhaoshenglong@huawei.com>
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Subject: Re: [Qemu-devel] Using tap device for qemu
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To: Gayathri Nagarajan <gayathrinagarajan18@gmail.com>, qemu-devel@nongnu.org

On 2015/3/10 12:59, Gayathri Nagarajan wrote:
> 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*
> 

Please check whether qemu-ifup exits at this directory and qemu-ifup has executable permission.

> *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
> 
> 


-- 
Thanks,
Shannon