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:
Apr. 21, 2009
Filed:
Mar. 17, 2006
Moe Hamamoto, Osaka, JP;
Takeshi Kokado, Kyotanabe, JP;
Moe Hamamoto, Osaka, JP;
Takeshi Kokado, Kyotanabe, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The NAT type of a router can be examined by communicating with one server having one IP address, and a P2P communication path is established efficiently using the NAT type obtained by the examination. A terminaltransmits a plurality of port number examination request packets having a plurality of port numbers of a serverset as the destination port. The terminalrefers to a port number examination response packet received from the serverto acquire a plurality of port numbers obtained by address translation by a routerfor the port number examination request packets respectively. The terminaldetermines the NAT type of the routerbased on the acquired translated port numbers. The terminalsandestablish a P2P communication path efficiently using the determined NAT type.