The tool you need is ettercap, it can use arp poising to perform a MITM attack.
I found this straight forward guide here:
Doing this stuff with a wireless card can throw more obstacles in your way, You should try this with a hard wired connection then try it over wifi, that way you know your doing the arp poising bit right.Code:http://openmaniak.com/ettercap_arp.php
Be careful on important networks is all can say, learned that one the hard way.
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