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. 25, 2008
Filed:
Sep. 28, 2006
Mitesh Dalal, Santa Clara, CA (US);
Amol Khare, Sunnyvale, CA (US);
Randall Stewart, Crystal Lake, IL (US);
Mitesh Dalal, Santa Clara, CA (US);
Amol Khare, Sunnyvale, CA (US);
Randall Stewart, Crystal Lake, IL (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
Approaches for preventing TCP RST attacks and TCP SYN attacks in packet-switched networks are disclosed. In one approach, upon receiving a TCP RST packet, a first endpoint node challenges the second endpoint node in the then-current connection using an acknowledgement message. If the connection is genuinely closed, the second endpoint node responds with a RST packet carrying an expected next sequence value. The first endpoint node takes no action if no RST packet is received. Thus, attacks are thwarted because an attacker does not receive the acknowledgment message and therefore cannot provide the exact expected next sequence value.