Patent ID: 7031310
Filing Date: 2006-04-18
Classification: H04L

Abstract:
1. A router provided on a boundary between the Internet and an intranet and used for receiving an incoming first packet and then passing on said first packet to a destination router indicated by a destination address of said first packet, said router comprising: a decapsulation unit for carrying out a process of decapsulating said first packet into a second packet in the case of said first packet including a predetermined address specified as said destination address; a first judgment unit for forming a judgment as to whether or not a user transmitting said first packet is an authorized user; a second judgment unit for forming a judgment as to whether or not the present time is within a time range allowed for said user transmitting said first packet; and a third judgment unit for forming a judgment as to whether or not said second packet obtained as a result of said process of decapsulating said first packet is allowed to pass through said intranet on the basis of a result of said judgment formed by said first judgment unit and a result of said judgment formed by said second judgment unit.