Packet filtering system and methods

Details Packet filtering system and methods Packet filtering system and methods

2005-11-08

2005-11-08

Nguyen-Ba, Antony (Department: 2192)

Electrical computers and digital processing systems: multicomput

Computer network managing

Computer network access regulating

C713S152000, C713S154000, C713S160000, C717S140000

Reexamination Certificate

active

06963913

ABSTRACT:
Small, optimized sequences of binary 5-tuples, representing filter rules, which achieve space efficient packet filtering. A post-match procedure table allows dynamic and extensible packet processing. Packet filtering is accomplished by processing filter rule statements and procedure statements, entered by a user in a rules file, to generate 5-tuple filtering rules and a procedure table, and loading the filtering rules and procedure table into the filter interpreter. A filter interpreter then applies the resolved filtering rules for each packet received at the network adapter. When a filtered packet matches a rule, a specified function is invoked.

REFERENCES:
patent: 5864683 (1999-01-01), Boebert et al.
patent: 5987611 (1999-11-01), Freund
patent: 6182228 (2001-01-01), Boden et al.
patent: 6233686 (2001-05-01), Zenchelsky et al.
patent: 6266707 (2001-07-01), Boden et al.
International Search Report for PCT Application No. PCT/US02/18108, Issued Oct. 23, 2003.

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