The rules of blocking internet for different users keep on changing as and when you see the technology changing. As you know how the technology is changing with a great pace, hence it is important to check the updates and the newer ways of doing so. Updating about these things can really help you a lot in doing this job in a right way. Now there are software like SKEEBLOO available in market for LAN and internet blocker, You can find more information on http://www.truetime-applications.com