How much overhead does a Wireshark capture file contain ?

["Henry Meleg" <hmeleg () nortel com>]

So I need to measure the traffic in bytes between two endpoints. If I
set up Wireshark on a laptop whose interface is enabled for promiscuous
mode and specify a capture filter between the source and destination IP
addresses that I am interested in and capture to a file then will that
file size be an accurate reflection of the traffic between the two
endpoint.
 
Does Wireshark add any overhead to the capture file that I need to take
into account by subtracting it from the captured file size to get a
accurate traffic figure which I require to set up bandwidth management
filters.
 
Can anybody help ?
 
Thanks in Advance, Henry.

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