[Qemu-devel] Using tap device for qemu

[Qemu-devel] Using tap device for qemu

[Gayathri Nagarajan]

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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

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Re: [Qemu-devel] Using tap device for qemu

[Shannon Zhao]

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

Re: [Qemu-devel] Using tap device for qemu

[Gonglei]

On 2015/3/10 14:32, Shannon Zhao wrote:
> 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.
> 
Yes, the script has to have executable permission.

Regards,
-Gonglei
>> *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
>>
>>
> 
>