Re: [OpenSIPS-Users] Checksum incorrect maybe caused by "UDP" checksum offload

2009-09-08 Thread Stanisław Pitucha 
2009/9/8  :
> The mysterious point is that all packets orginating from the interface
> (192.168.20.20) towards UAC(192.168.20.1) have Bad checksum in the UDP
> level.

If you're capturing at the machine that has the 192.168.20.20
interface, then everything is ok. You're seeing wrong checksum on your
traces because it's calculated on your network card instead - so when
you capture the packet the checksum is probably still filled with
zeros.
Just ignore it, or disable the highlighting of bad checksums. If you
disable the offloading, you'll see the result you expect, but you'll
also give your CPU a bit more work on every packet, so for RTP that's
impacting both latency and throughput.

___
Users mailing list
Users@lists.opensips.org
http://lists.opensips.org/cgi-bin/mailman/listinfo/users

Re: [OpenSIPS-Users] Checksum incorrect maybe caused by "UDP" checksum offload

2009-09-08 Thread Thomas Gelf 
> The mysterious point is that all packets orginating from the interface  
> (192.168.20.20) towards UAC(192.168.20.1) have Bad checksum in the UDP
> level. This happened with/without RTPproxy, so i'm wondering whether I  
> should care about this problem or not because the sound is conveyed  
> and everything seems okay.

I guess everything is fine. Try to disable checksum offloading (using
ethtool), your capture should look fine then.

Cheers,
Thomas

-- 
 mail: tho...@gelf.net
  web: http://thomas.gelf.net/


___
Users mailing list
Users@lists.opensips.org
http://lists.opensips.org/cgi-bin/mailman/listinfo/users

Re: [OpenSIPS-Users] Checksum incorrect maybe caused by "UDP" checksum offload

2009-09-08 Thread Ghaith . ALKAYYEM 
I'm using Wireshark

Saúl Ibarra  a écrit :

> How are you making the packet captures? If tcpdump, did you use -s0?
>
>
> --
> /Saúl
> http://www.saghul.net | http://www.sipdoc.net
>
> ___
> Users mailing list
> Users@lists.opensips.org
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>



___
Users mailing list
Users@lists.opensips.org
http://lists.opensips.org/cgi-bin/mailman/listinfo/users

Re: [OpenSIPS-Users] Checksum incorrect maybe caused by "UDP" checksum offload

2009-09-08 Thread Saúl Ibarra 
How are you making the packet captures? If tcpdump, did you use -s0?


-- 
/Saúl
http://www.saghul.net | http://www.sipdoc.net

___
Users mailing list
Users@lists.opensips.org
http://lists.opensips.org/cgi-bin/mailman/listinfo/users

[OpenSIPS-Users] Checksum incorrect maybe caused by "UDP" checksum offload

2009-09-08 Thread Ghaith . ALKAYYEM 
Hello,

Could anybody tell me what is the problem with such a configuration:


--- 
   
(UAC)192.168.10.1 |===> |192.168.10.10 [OpenSIPS]  
192.168.20.20|===> |(UAC)192.168.20.1 |
--- 
   


The mysterious point is that all packets orginating from the interface  
(192.168.20.20) towards UAC(192.168.20.1) have Bad checksum in the UDP
level. This happened with/without RTPproxy, so i'm wondering whether I  
should care about this problem or not because the sound is conveyed  
and everything
seems okay.

Regards.


___
Users mailing list
Users@lists.opensips.org
http://lists.opensips.org/cgi-bin/mailman/listinfo/users