The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 2008
Filed:
Apr. 20, 2004
Yasushi Yokomitsu, Chikushino, JP;
Akio Yao, Fukuoka, JP;
Toshiyuki Hamasaki, Fukuoka, JP;
Hiroshi Konishi, Kasuga, JP;
Masahiro Shigyo, Chikushi-gun, JP;
Yuji Mitsunaga, Dazaifu, JP;
Kiminori Washitani, Fukuoka, JP;
Hideaki Nagao, Dazaifu, JP;
Yasushi Yokomitsu, Chikushino, JP;
Akio Yao, Fukuoka, JP;
Toshiyuki Hamasaki, Fukuoka, JP;
Hiroshi Konishi, Kasuga, JP;
Masahiro Shigyo, Chikushi-gun, JP;
Yuji Mitsunaga, Dazaifu, JP;
Kiminori Washitani, Fukuoka, JP;
Hideaki Nagao, Dazaifu, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a repeater which automatically closes a dynamically opened port in accordance with prior setting, the repeater including: a port mapping table where a global IP address and an external port number, or an external port number on the Internet is associated with a local IP address and an internal port number of a terminal connected to a LAN; a control unit which, receiving a communications packet to which an external port number is specified, converts the external port number to an internal port number based on the port mapping table and transfers the internal port number to the LAN; a timer unit which counts the unoccupied time of the port after transferring a communications packet to which an external port number is specified; and a port management unit which checks whether the registered machine is present on the LAN and in case it is absent, deletes registration concerning the external port number from the port mapping table.