For Windows i use a very nice app http://www.skygrabber.com/en/langrabber.php. The software auto detect the contente of packets in lan or wlan and save all data files.
You can configure the software with filters, if you want to save jpeg, htmls, audio, flv and a lot of types of data files.
The main problem is the Windows, hard to change the mac and other litle problems.
Backltrack have any similar software to auto save data files for lan and wlan networks?
Like as: http://i1-win.softpedia-static.com/s...nGrabber_2.png