Patent ID: 7529810
Filing Date: 2009-05-05
Classification: H04L

Abstract:
1. A Dynamic Domain Name System (DDNS) server connected to a DDNS client terminal, comprising: a table comprising a domain name, a global IP address and a port number of the DDNS client terminal; and a terminal management section that manages said table, wherein the terminal management section receives from the DDNS client terminal a request for writing the global IP address of the DDNS client terminal stored in the table, the request including a new global IP address and a new port number corresponding to the new global IP address, determines whether the new global IP address and the new port number are stored in the table, permits writing of the global IP address when it is determined that the new global IP address is stored and the new port number is not stored in the table, and writes the new global IP address and the new port number in the table, and wherein authentication information is stored and said terminal management section compares the authentication information with authentication information in a header of the request to write the global IP address to determine whether the access of the request to overwrite the global IP address is an authorized access.