[Click] FromDevice->Todevice Loop

[Robert Sombrutzki]

Hi,
i discovered the same behavior. It's seem to be related to the usage of pcap.
If i use the following example, it works (no loop).
FromDevice(eth0,  METHOD LINUX, PROMISC true)->Queue->ToDevice(eth0, METHOD 
LINUX );

The next script causes the loop:
FromDevice(eth0,  METHOD PCAP, PROMISC true)->Queue->ToDevice(eth0);

You didn't use the param METHOD, but in the git PCAP is the default capture 
method. Can you please check, whether you script causes a loop, if you 
use "METHOD LINUX" ?

Best regards,
Robert

On Samstag, 9. Juli 2011, Antonie Henning wrote:
> Hi,
>
> Something I discovered with the latest git pull code:
>
> Using the same interface in a fromdevice and todevice element, seems to
> cause a loop e.g.
>
> Eth0 receives 1 pps but transmits e.g. 80k pps @ 1500bytes or line rate
> 1gbps. This can be replicated with the config below:
>
> FromDevice(eth0, PROMISC true)->Queue->ToDevice(eth0);
>
> To test this the following example can be used at the source of the
> packets:
>
> // Where ethX is connected to eth0:
> RatedSource(DATA \<DATA>, RATE 1, LIMIT 10, ACTIVE true, STOP true) ->
> Queue -> ToDevice(ethX); FromDevice(ethX, PROMISC true)
> -> c::Counter -> Queue -> Discard;
>
>
> Script(
>     wait 1,
>     print c.rate,
>     loop
> );
>
> Changing the interface in the ToDevice to a different interface e.g. eth1
> solves the problem...
>
> When adding another fromdevice and todevice pair even with different
> interfaces (as long as a fromdevice interface and todevice interface match
> somewhere in the config) the problem returns e.g FromDevice(eth0, PROMISC
> true)->Queue->ToDevice(eth1);
> FromDevice(eth1, PROMISC true)->Queue->ToDevice(eth0);
>
> I have checked whether this is because of promiscuous mode but found the
> same result when removing promisc and using EtherEncap.
>
> A
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