Blended SYN cookies

Electrical computers and digital processing systems: multicomput – Computer-to-computer session/connection establishing – Session/connection parameter setting

Reexamination Certificate

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Details

C709S227000, C709S229000, C709S237000, C726S026000, C370S254000

Reexamination Certificate

active

07058718

ABSTRACT:
A method of producing a blended SYN cookie can include identifying within a SYN packet a source network address and desired communications session parameters. Subsequently, an index value into a table of pre-configured sets of communications session parameters can be retrieved. Notably, the index value can reference one of the sets which approximates the desired communications parameters. A hash value can be computed based upon the source network address, a constant seed and current date and time data. Finally, the computed hash value can be combined with the index value, the combination forming the blended SYN cookie.

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patent: 6779033 (2004-08-01), Watson et al.
patent: 2002/0103916 (2002-08-01), Chen et al.
S. Thomason,Building Blocks of Linux Packet Filtering In The 2.2 Kernel, <http://www.linuxsecurity.com/resource—files/tirewalls/linux-packet-filtering-2.2.html>, (Oct. 8, 2001).
S. Gibson,A Simple TCP/IP Implementation Enhancement To Eliminate Denial Of Service (DoS) Vulnerability, Parts I and II,Gibson's Encryption-Enhanced Spoofing Immunity System, <http://grc.com/r&d
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NAT—Computer Networking, <http://compnetworking.about.com/library/glossary/bldef-nat.htm?terms=nat>, (Oct. 12, 2001).
D.J. Bernstein,SYN Cookies, <http://cr.yp.to/syncookies.html>, (Oct. 8, 2001).

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