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:
Nov. 03, 2009
Filed:
Feb. 03, 2006
Yogesh P. Swami, Irving, TX (US);
Franck Le, Pittsburgh, PA (US);
Yogesh P. Swami, Irving, TX (US);
Franck Le, Pittsburgh, PA (US);
Nokia Corporation, Espoo, FI;
Abstract
A method for operating a firewall includes: in response to the firewall receiving a TCP SYN request packet that is sent towards a first node from a second node, the TCP SYN request packet comprising a sequence value ('seq'), sending to the second node a SYN|ACK packet, the SYN|ACK packet comprising a seq and an ack_sequence value ('ack_seq'), where ack_seq of the SYN|ACK packet is not equal to the TCP SYN request packet's seq+1; and in response to the firewall receiving a TCP RST packet from the second node, verifying that the seq in the TCP RST packet matches the ack_seq of the SYN|ACK packet and, if it does, designating the connection with the second node as an authorized connection.