Wireshark-users: Re: [Wireshark-users] end-to-end delay calculation

From: "Martin Mathieson" <martin.r.mathieson@xxxxxxxxxxxxxx>
Date: Thu, 13 Mar 2008 11:08:12 +0000
Since you were previously talking about RTP, if you had RTCP reports being sent in both directions, you can calculate the network rountrip propagation delay using the timestamps only from one side.

Wireshark already does this calculation, if you turn the appropriate preferences on for the RTCP dissector.

On Thu, Mar 13, 2008 at 11:01 AM, <juan.wortley@xxxxxxx> wrote:
Hi Fabiana,
 
the only way to do that is if you know the time difference between the machines.
It´s not so easy however if you use windows you could try synchronizing both endpoints by using:
w32tm /config /manualpeerlist:[IP to synchronize to] /update /syncfromflags:MANUAL
 
and then monitor the time difference with:
w32tm /stripchart /computer:[IP to synchronize to]
 
,you always can have a delay reference by pinging and dividing by 2 the RTT.
 
HTH
Juan
 


From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of ext Fabiana moreno
Sent: Miércoles, 12 de Marzo de 2008 09:38 a.m.
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] end-to-end delay calculation

so ... it is not reliable if i substract the time i hav in the client minus the time i have in the server to get my end the end delay? 

On 12/03/2008, Hansang Bae <hbae@xxxxxxxxxx> wrote:
Fabiana moreno wrote:
> Hello there,
>
> I know wireshark is not able to calculate the end-to-end delay of a
> packet when streaming. I was just wondering if adjusting the clocks of
> my two computers(sender and receiver) to the network time protocol and
> having the sniffer at both ends i could calculate the end-to-end-delay
> tracing each packet. Does this sound logical?
>


It is within the limits of ntp.  Unless there is a WAN involved, the
packets are flying around at an order of magnitude faster than what ntp
can provide (ms resolution)

--

Thanks,
Hansang
_______________________________________________
Wireshark-users mailing list
Wireshark-users@xxxxxxxxxxxxx
http://www.wireshark.org/mailman/listinfo/wireshark-users


_______________________________________________
Wireshark-users mailing list
Wireshark-users@xxxxxxxxxxxxx
http://www.wireshark.org/mailman/listinfo/wireshark-users