[Tao Lin <talin@xxxxxx>]

>===== 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!