LANguard Internet access control - Version 3.0 Monitors all Internet traffic to prevent unproductive use of the Internet. Its rules engine allows you to specify which sites are allowed, and what type of content your users can search for or read. LANguard has extensive internet usage reporting tools. Because LANguard uses a sniffer engine, it is easy to install and does not affect Internet performance or require you to reconfigure your network clients. It also protects against; External threats (hackers), Internal threats (users accessing shares they are not authorized).