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:
Jun. 24, 2014
Filed:
Sep. 14, 2011
Satoru Takagishi, Osaka, JP;
Masaru Fuse, Osaka, JP;
Yosuke Matsushita, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A terminal device includes a connection environment check unit, a determination purpose port mapping command unit which issues a port mapping command to a lower layer NAT device, and a determination packet generation unit which generates a determination packet which is source-routed. Additionally, a determination packet transmitting unit transmits the determination packet, a determination packet receiving unit receives the determination packet transmitted from the determination packet transmitting unit, passing through the upper layer NAT device a and the lower layer NAT device a and arriving at the terminal device a, and a port number obtainment unit obtains a WAN-side port number of the lower layer NAT device a indicated in the received determination packet.