5. A method for maintaining security in intranet and internet communication comprising: providing a plurality of databases requiring differing user security levels to access their contents on the intranet; an intranet security data base listing clearance levels for intranet users with a user ID and an active codeword along with a listing of approved LAN users with their port locations by their MAC and IP addresses; a LAN within the intranet having a security system responsive to a user ID and a codeword in the intranet security database to assign a port location of the LAN to the users; using the security system to continuously provide periodic comparisons of MAC and IP addresses of active users currently accessing the LAN against the assigned port locations of the active users to detect any active user switching ports from the active user's assigned port location to a port location with a less restrictive clearance level; responding to the periodic comparisons of the LAN security system by disabling one or more ports when a comparison does not show identity of data of the any active users presently used and assigned port locations; having the LAN security system assign security ratings to port sites; checking the user ID and password of a prospective user of a particular port site to determine whether the user is an approved LAN user; checking the security level of the prospective user against the assigned security rating of the particular port site; assigning use of the particular port site to the prospective user in the case that the prospective user is an approved LAN user and has the appropriate security level at least matching the security level of the particular port site; directing the prospective user to use a proper port site with a lower security rating in the case that the prospective user is an approved LAN user but does not have the appropriate security level to access the particular port site; recording IP and MAC of the particular port assigned to the prospective user; using the recorded data to periodically compare an on-line port location of the prospective user against the user's assigned particular port site at a rate that assures the check proceeds the prospective users request for data; shutting down the prospective user's assigned port and used port location to prevent the transfer of data when the on-line port location is not the assigned port location of the prospective user; and providing access when the on-line port location of the prospective user is the same as the location assigned the prospective user.
7. The method of claim 5 , wherein the LAN security system assigns a security rating to a port site based on a security rating of a user assigned that port site.