RE: [Ethereal-users] Question about Tools->Summary in Ethereal

["Visser, Martin (SNO)" <Martin.Visser@xxxxxxxxxx>]

To sanity check the calculations construct a display filter for a single one
second interval and use the Protocol Hierarchy stats in conjunction with
Summary and some manual calcs. Send your results back to the list and we can
then check the numbers out. My guess is that your actual transmission rate
is not as constant as you might hope.

Martin Visser
Network Consultant - Compaq Global Services

Compaq Computer Australia
410 Concord Road
Rhodes, Sydney NSW 2138
Australia

Phone: +61-2-9022-5630
Mobile: +61-411-254-513
Fax:+61-2-9022-7001
Email:martin.visser@xxxxxxxxxx



-----Original Message-----
From: Tao Lin [mailto:talin@xxxxxx]
Sent: Tuesday, 5 June 2001 11:54 AM
To: Guy Harris; Tao Lin
Cc: ethereal-users
Subject: RE: [Ethereal-users] Question about Tools->Summary in Ethereal


>===== Original Message From Guy Harris <guy@xxxxxxxxxx> =====
>> Can anyone tell me how Ethereal calculates the transmission speed?
>
>If, by "average transmission speed" you mean the "Avg. bytes/sec" value
>in the summary dialog box, it's the sum of the sizes of all of the
>packets, in bytes, divided by the time, in seconds, between the time
>stamp of the first packet and the time stamp of the last packet.

Thanks, but as I said in my email, the interval time is less than I
expected, 
(which implies that the average speed should be higher than I expected), but

the average speed in the summary is also less than I expected. I think this
is 
not reasonable. I still can't figure out the reason for it.

Thanks anyway!


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