How to use a "wireshark sniffer PC" to capture ftp flows between 2 terminals located on 2 # sub-networks ?

["AMEAUME, ALAIN (ALAIN)** CTR **" <alain.ameaume () alcatel-lucent com>]

Hi users,

I'm interesting to know how to insert my PC laptop with wireshark as a" PC sniffer" between 2 terminals to capture ftp 
flows between them:

terminal "A" in sub-network x.y.A.1
terminal "B" in sub-network x.y.B.1
my PC laptop "C" on sub-network x.y.A.2 or x.y.B.2

using this configuration, I do not need to install wireshark on A & B !

I suppose that on "A" terminal I need to create a route from A.1 to B.1 passing thru "C", the same relatively to "B", 
then I will need also to declare on my laptop "C" a kind of "gateway" function to re-route the ftp flow, after capture, 
to its original destination 
 Is it what we call the NAT function on "C": and how to do it on the "C" laptop windows xp sp3 ?

Thanks for your help.

Alain
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