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List:       ethereal-users
Subject:    RE: [Ethereal-users] Frames and timestamps
From:       "Anders Broman (AL/EAB)" <anders.broman () ericsson ! com>
Date:       2006-03-30 6:54:14
Message-ID: C449F18A1C0F294CAF4C0515A18D6EE60303F2E7 () esealmw107 ! eemea ! ericsson ! se
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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@ethereal.com \
                [mailto:ethereal-users-bounces@ethereal.com] On Behalf Of David López \
                Pérez
Sent: den 29 mars 2006 11:01
To: ethereal-users@ethereal.com
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@sonic.net>
> Reply-To: Ethereal user support <ethereal-users@ethereal.com>
> To: Ethereal user support <ethereal-users@ethereal.com>
> 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?) 
> _______________________________________________
> Ethereal-users mailing list
> Ethereal-users@ethereal.com
> http://www.ethereal.com/mailman/listinfo/ethereal-users


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