tcpreplay for testing network stacks

[Christian Mauderer]

Hello Vijay,

On 28/04/2021 18:25, Vijay Kumar Banerjee wrote:
> On Wed, Apr 28, 2021 at 12:41 AM Christian MAUDERER
> <christian.mauderer at embedded-brains.de> wrote:
>>
>> Hello Vijay,
>>
>> Am 27.04.21 um 18:48 schrieb Vijay Kumar Banerjee:
>>> Hi,
>>>
>>> I came across the tcpreplay tool and it looks like a nice tool for
>>> testing the network stacks. It can be used to capture network traffic
>>> and then play it back, this will help with testing the network packets
>>> from different network stacks.
>>
>> Sounds like an interesting tool.
>>
>>>
>>> My proposal is to add the tcpreply as a host-side tool in rtems-tools
>>> and use it with the network interface where the network application is
>>> running. The only issue that I see with the whole idea is that the
>>> tcpreplay is GPLv3 licensed. Will that be compatible for rtems-tools?
>>> The github repository says that it's compatible with UNIX and Windows
>>> with cygwin.
>>
>> The more difficult problem could be the missing Mac and FreeBSD support.
>>
> That's a good point.
> 
>> What would be the advantage of having tcpreply in rtems-tools? Do you
>> want to use it for automated tests?
>>
> Yes. I was thinking about capturing the pcap format packets in
> temporary files and then running tcpreplay to check for any network
> issues. I haven't planned exactly how that will be implemented but
> roughly this is the idea.
> 

In what form would you automate that? Some test case in RTEMS or some 
special repository? I assume that you need some special setup for 
specific (simulator) targets anyway, don't you? So a general purpose 
test for all targets will be difficult.

If it is about testing the stacks and not the drivers, it might would be 
possible to write some kind of dummy network driver that can read pcap 
format (or some other raw packet format) directly and hands the packets 
to the network stack. Such a driver maybe could even provide packets to 
a test frame again so that you can check responses.

Best regards

Christian

>> Best regards
>>
>> Christian
>>
>>>
>>> Source repository:https://github.com/appneta/tcpreplay
>>> <https://github.com/appneta/tcpreplay>
>>>
>>> Thoughts and suggestions are much appreciated.
>>>
>>>
>>> Best regards,
>>> Vijay
>>>
>>> _______________________________________________
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>>> devel at rtems.org
>>> http://lists.rtems.org/mailman/listinfo/devel
>>>
>>
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