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

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

On 02/01/2016 05:11 PM, Dr. David Alan Gilbert wrote:
> * Li Zhijian (lizhijian@cn.fujitsu.com) wrote:
>>
>>
>> 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
>
> My guess is that it's IPv6 related; check the /etc/hosts so see if there's
> a ::1 entry for localhost; I've seen some weird behaviour on rhel in the
> same way but in other uses.

Thank you Dave,
As you said, there are 2 entry record (ipv4 and ipv6) for "localhost" at my /etc/hosts
after removing the ipv6 entry, the whole world become fine ^_^

Thanks
Li Zhijian

>
> Dave
>
>>
>>>>> 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
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>> .
>>>
>>
>>
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>
>
> .
>

-- 
Best regards.
Li Zhijian (8555)