netdev - Re: send/receive data via eth0/1 external loop ?

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Message-ID: <1917296016.1454031.1321139740439.JavaMail.fmail@mwmweb017>
Date:	Sun, 13 Nov 2011 00:15:40 +0100 (CET)
From:	"Roland Kletzing" <devzero@....de>
To:	"Julian Anastasov" <ja@....bg>
Cc:	netdev@...r.kernel.org
Subject: Re: send/receive data via eth0/1 external loop ?

to confirm: IT WORKS! (tested with 2.6.38 kernel)  :)

more detail:
>> You can use accept_local flag and rule with pref 0:
>>
>>http://marc.info/?l=linux-netdev&m=125983955627148&w=2

this in itself is not enought to get it running, but with this one
http://marc.info/?l=linux-netdev&m=129500124207256&w=2
(adapted for eth0/1), it looks good  and i see packets flow between eth0/1

thanks again for the pointer !

regards
Roland


-----Ursprüngliche Nachricht-----
Von: "Roland Kletzing" <devzero@....de>
Gesendet: 12.11.2011 19:50:33
An: "Julian Anastasov" <ja@....bg>
Betreff: Re: send/receive data via eth0/1 external loop ?

>great, thanks!
>
>
>-----Ursprüngliche Nachricht-----
>Von: "Julian Anastasov" <ja@....bg>
>Gesendet: 12.11.2011 19:31:13
>An: "Roland Kletzing" <devzero@....de>
>Betreff: Re: send/receive data via eth0/1 external loop ?
>
>>
>> Hello,
>>
>>On Sat, 12 Nov 2011, Roland Kletzing wrote:
>>
>>> Hello,
>>> i`m searching for a while now, but i did not find a solution, so forgive when
>>> i`m (as a user) asking for expert help here.
>>>
>>> I want to do some network stress/burn-in and quality/reliability testing,
>>> i.e. i want to send/receive large amounts of data trough the systems network
>>> interfaces without the need of hogging the net or other systems.
>>>
>>> so, that test should run "loopback", i.e. connecting eth0+1 via crossover cable
>>> or via locally attached switch. I don`t want to use a second system for that.
>>>
>>> testing at ip/tcp level would be favourable , but raw eth level would be also fine.
>>>
>>> But how ?
>>> What appears simple on a first view, seems to be difficult.... :(
>>>
>>> All i came across is this report:
>>> http://www.zyztematik.com/?p=10
>>> and this description of a patch:
>>> http://www.ssi.bg/~ja/send-to-self.txt
>>>
>>> Does somebody know a proper way of achieving this without patching the
>>> kernel ?
>>
>> You can use accept_local flag and rule with pref 0:
>>
>>http://marc.info/?l=linux-netdev&m=125983955627148&w=2
>>
>>Regards
>>
>>--
>>Julian Anastasov <ja@....bg>
>


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