Hi,
I have tried to collect some info on "Timestamping" from the mail archives on:
http://wiki.ethereal.com/Timestamps
Brg
Anders
-----Original Message-----
From: ethereal-users-bounces@xxxxxxxxxxxx [mailto:ethereal-users-bounces@xxxxxxxxxxxx] On Behalf Of David López Pérez
Sent: den 29 mars 2006 11:01
To: ethereal-users@xxxxxxxxxxxx
Subject: Re: [Ethereal-users] Frames and timestamps
Hello
I'm working in my final project, it's:
MEASURING ROUND TRIP TIMES TO DETERMINE THE DISTANCE BETWEEN WLAN NODES
It's very very important for me knows the time at which the packets arrive at the wlan card.
Now, I have this problem.
For example, sometimes the ICMP request is timestamped later than the ICMP reply.
Do you know how i can resolve this problem?
I'm using Windows XP Home and toshiba m70-155 lap top.
Maybe is better use other OS? For example WindowsXP Professional.
>From: Guy Harris <gharris@xxxxxxxxx>
>Reply-To: Ethereal user support <ethereal-users@xxxxxxxxxxxx>
>To: Ethereal user support <ethereal-users@xxxxxxxxxxxx>
>Subject: Re: [Ethereal-users] Frames and timestamps
>Date: Wed, 29 Mar 2006 00:34:56 -0800
>
>David López Pérez wrote:
>
>>Why the frames and the timetamps aren't in the same order?
>>
>>For example, in this figure:
>>Why the frame 38 is before in time than the frame 39?
>> -- frame 38 --> 4.781393s
>> -- frame 39 --> 4.781360s
>
>Because some OSes apparently have the annoying habit of not delivering
>packets to the mechanism used by libpcap in the order in which they're
>time-stamped (note that the time at which a packet is time-stamped
>could be different from the time at which it arrived at the host's network adapter).
>
>(Is this Linux? Is it on a multiprocessor machine?)
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