Re: IP Error (Header Checksum) can effect Jitter calculation ?

[Martin Visser <martinvisser99 () gmail com>]

If those packets show up in the RTP analysis, then they are obviously are
accepted at that level, so no worries in my opinion.
Regards, Martin

MartinVisser99 () gmail com


On Tue, Jun 1, 2010 at 10:31 PM, capricorn 80
<cool_capricorn80 () hotmail com>wrote:

> Thanks Martin. So i should not be worry in case of RTP calculation.
>
> Regards,
>
> ------------------------------
> Date: Tue, 1 Jun 2010 21:31:40 +1000
>
> From: martinvisser99 () gmail com
> To: wireshark-users () wireshark org
> Subject: Re: [Wireshark-users] IP Error (Header Checksum) can effect Jitter
> calculation ?
>
> The most likely cause of checksum "errors" when capturing packets with
> Wireshark is the driver/NIC combination of the machine you are doing this
> with. Many NICs are able to offload this function from the main CPU,
> improving performance. The normal network driver knows to ignore the
> checksum, not doing the work, and assumes it is being handled correctly by
> the NIC. Wireshark however calculates the checksum by default and matches it
> with what is in the packet, reporting the error falsely. It is unlikely you
> will receive real errors with Wireshark, as the CRC32 checks by the NIC and
> switch will drop errored packets and you won't see them. So you are best off
> turning this feature off in the appropriate preferences section for each
> protocol.
>
> See http://www.wireshark.org/docs/wsug_html_chunked/ChAdvChecksums.htmlfor more details.
>
> Regards, Martin
>
> MartinVisser99 () gmail com
>
>
> On Tue, Jun 1, 2010 at 4:55 PM, capricorn 80 <cool_capricorn80 () hotmail com
> > wrote:
>
>
> Hi!
>
>
> In IP section
>
>
> Header checksum: 0x0000 [incorrect, should be 0x5a54]
> Bad : True
>
> Regards,
>
>
>
>
>
> ------------------------------
> Date: Mon, 31 May 2010 12:27:53 +1000
> From: martinvisser99 () gmail com
>
> To: wireshark-users () wireshark org
> Subject: Re: [Wireshark-users] IP Error (Header Checksum) can effect Jitter
> calculation ?
>
>
> Provided the packet is identified as RTP, it should be included. What
> errors are you referring to?
>
> Regards, Martin
>
> MartinVisser99 () gmail com
>
>
> On Sun, May 30, 2010 at 2:53 AM, capricorn 80 <
> cool_capricorn80 () hotmail com> wrote:
>
>
>
> Hi!
>
>  I have taken few trace of jitter using wireshark. In one of the trace i
> can see some error in Internet protocl sections. Does that effect the jitter
> calculation ?
>
> Regards,
>
> Sajid
>
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