Re: [Qemu-devel] [PATCH V2] net/traffic-mirror:Add traffic-mirror

[Li Zhijian <lizhijian@cn.fujitsu.com>]

On 02/01/2016 10:57 AM, Jason Wang wrote:
>
>
> On 01/29/2016 09:38 AM, Li Zhijian wrote:
>>
>>
>> On 01/28/2016 01:44 PM, Jason Wang wrote:
>>>
>>>
>>> On 01/27/2016 10:40 AM, Zhang Chen wrote:
>>>> From: ZhangChen <zhangchen.fnst@cn.fujitsu.com>
>>>>
>>>> Traffic-mirror is a netfilter plugin.
>>>> It gives qemu the ability to copy and mirror guest's
>>>> net packet. we output packet to chardev.
>>>>
>>>> usage:
>>>>
>>>> -netdev tap,id=hn0
>>>> -chardev socket,id=mirror0,host=ip_primary,port=X,server,nowait
>>>> -traffic-mirror,id=m0,netdev=hn0,queue=tx/rx/all,outdev=mirror0
>>>>
>>>> Signed-off-by: ZhangChen <zhangchen.fnst@cn.fujitsu.com>
>>>> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
>>>> Reviewed-by: Yang Hongyang <hongyang.yang@easystack.cn>
>>>
>>> Thanks for the patch. Several questions:
>>>
>>> - I'm curious about how the patch was tested? Simple setup e.g:
>>>
>>> -netdev tap,id=hn0 -device virtio-net-pci,netdev=hn0 -chardev
>>> socket,id=c0,host=localhost,port=4444,server,nowait -object
>>> traffic-mirror,netdev=hn0,outdev=c0,id=f0 -netdev
>>> socket,id=s0,connect=127.0.0.1:4444 -device e1000,netdev=s0
>>>

a strange thing is about "host=localhost", connection is refused at SUSE 11.3 but
connection is connected successfully at Ubuntu 15.10 if i launch qemu with the
command line above.
I try to launch qemu at three physical machines installed with SUSE 11.3, they all
connect failed. But when I specified "host=127.0.0.1", the connection is OK.

I have comfirmed that:
- "localhost have pointed to 127.0.0.1 if I "ping localhost" at SUSE
- "telnet localhost 4444" works at SUSE


>>> does not works for me.
>> Hi， Jason
>>
>> I just test the mirror using the command line above, it don't work too.
>> I am looking to it, and find that seems because the -net socket
>> problem that
>> I have ever post a patch  try to fix（refer to ↓）
>> [Qemu-devel] [PATCH] report a error message if -net socket can not
>> connect to server
>> https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg00758.html
>
> Will have a look at this.
>
>>
>> after applying this patch, the qemu monitor tell me following message:
>> (qemu) qemu-system-x86_64: net socket is not connected Connection refused
>
> Maybe two issues. Have you tired to start the mirror on one VM and then
> using socket backend to connect it from another VM?

Yes, if i connect the mirror on VM1 using socket backend from another VM2, the connection
is established successfully. But on VM2 guest, I can't dump any packet using 'tcpdump'
That's because in current version code, mirror is not compatible with socket backend and
we will fix it in next version.


Best regards.
Li Zhijian

>
>>
>>
>> Thanks
>> Li Zhijian
>>
>>
>>
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