Redirecting traffic

[fusionache]

Hello.

I'm currently managing a campus dorm with almost 600 students.

Working on my thesis on capturing traffic, I want to get data from server in order to use this datas on some graphics.

The question is, is there a possibility to make a webservice to get some packages, or I should make a proxy server in order to redirect all traffic on a client from LAN and save data.

Thanks a lot.