<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by djdementia:<BR>I'm curios how they determine the email address. Does everyone get static IP addresses and they have a database of IP -> Email addresses? Do they use the same DPI to grab the user's email address when they send or receive an email? What if the user doesn't use an SMTP/POP3 based email service and only uses webmail, how then would the email address be obtained? How would this work with for example wifi, where you are likely to obtain a different IP address as you roam around campus? Do they have a web portal system that requires you to register your email address then emails back an authorization code? </div></BLOCKQUOTE><BR><BR>First, this is a campus network, so every user has an email at which they can be reached.<BR><BR>Second, tracking. Yes, with multiple "shared" machines throughout the campus, you could attach P2P activity to the "last email address" and/or the "next email address" (assuming that email was checked within a certain span of time around the P2P activity), or any other logged-in service. It's just as easy to capture the logs of a webmail server as it is to capture the logs of an SMTP/POP3 server, so I don't see what the distinction might be there. Wifi adds an extra hop, but the "truth" identifier is the MAC address (which, yes, can be spoofed, but is unlikely), which, again, can be tracked and attached to the IP address.<BR><BR>Third, personal identification. The "hard" thing here is that in many cases on a campus you will have a single machine which is shared by a dorm room (2-3 students or perhaps 4-8 students). This is more likely to house P2P than a truly computer lab situation, and needs the above traffic analysis to attach actual users to P2P activity.<BR><BR>IMHO, sending an email to anyone who logged in to a campus service WHILE P2P activity was going on on the machine can and should get an email. And that's dead simple to determine.