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:
Feb. 02, 2010
Filed:
Apr. 11, 2005
Patricia A. Jakubik, Raleigh, NC (US);
Linwood Hugh Overby, Jr., Raleigh, NC (US);
Joyce Anne Porter, Apex, NC (US);
David John Wierbowski, Owego, NY (US);
Patricia A. Jakubik, Raleigh, NC (US);
Linwood Hugh Overby, Jr., Raleigh, NC (US);
Joyce Anne Porter, Apex, NC (US);
David John Wierbowski, Owego, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Preventing duplicate sources on a protocol connection that uses network addresses, protocols and port numbers to identify source applications that are served by a NAPT. If an arriving packet encapsulates an encrypted packet and has passed through an NAPT en route to the destination host, the encapsulated packet is decrypted to obtain an original source port number and original packet protocol from the decrypted packet. A source port mapping table (SPMT) is searched for an association between the NAPT source address, the original source port, and the original packet protocol associated with the NAPT source address and port number. If an incorrect association is found, the packet is rejected as representing an illegal duplicate source; that is, a second packet from a different host served by a NAPT that is USING the same SOURCE port and protocol.