Name server, network system, reverse request processing method, forward request processing method and communication control method

摘要

PROBLEM TO BE SOLVED: To provide a network system that protects a communication node and the privacy of a user and at the same time enables the response of a name server.;SOLUTION: A server F receives a connection request from a host H, and transmits a backward look-up request to the name server N for the IP address of the host H. The server N retrieves a table for forward look-up regarding the IP address, and generates a host name corresponding to the IP address one to one for responding if there are no corresponding host names. The server F transmits the forward look-up request to the name server M regarding the host name received from the server N. The server M retrieves the table for forward look-up regarding the requested host name, and generates the IP address corresponding to the host name one to one for responding if there are no IP addresses. The server F compares the IP address from the server M with that of the host H. When the IP address from the server M coincides with that of the host H, the connection request is permitted. Otherwise, the connection request is rejected.;COPYRIGHT: (C)2004,JPO