["Prokash Sinha" <prokashs@xxxxxxxxx>]

Thanks Luis,

 

The packets happen to have non-zero mismatched checksum ...

 

Usually over utls ( i.e tls over udp), I don't see this. In fact the SIP packets  [INVITE, Ringing, ACK, OK etc] gets sent across fine ... Also for tcp checksum, under windows it is showing intel pro/1000 mt, and it is more like a mother board controller (rather than a daughter card). Gooling seems to make me feel that it has offloading capabilities, but could not find anything particular to look at using Device manger for the controller... Was thinking that it would be under Qos, but that is disabled ...

 

Oh well, let me try to see what the openssl does ( without using the SIP layer).  I was thinking may be some one can point me to a site that details the packet sequence under tcp-tls...

 

Thanks for the link you gave me though.

 

-pro

On Thu, Sep 25, 2008 at 12:42 PM, Luis EG Ontanon <luis@xxxxxxxxxxx> wrote:

if all checksums for outgoing packets are 0 that means that checksum
calculation is offloaded.

http://wiki.wireshark.org/TCP_checksum_offload

On Thu, Sep 25, 2008 at 9:35 PM, Prokash Sinha <prokashs@xxxxxxxxx> wrote:
> I'm using open source eXosip/sip over openssl...
>
> I see that zieto-comms ( i.e. port 3766 ) or some other port is trying to
> initiate a TCp connection ( Syn )... Then when it gets [SYN,ACK] packet,
> client side is trying to send  [ACK] with [TCP CHECKSUM INCORRECT]
>
> Anyone could you shed lights on this?
>
> -pro

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