Dynamic packet filter utilizing session tracking
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United States of America Patent
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-
Nov 9, 2004
Grant Date -
Jan 22, 2004
app pub date -
May 9, 2001
filing date -
May 9, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A novel and useful dynamic packet filter that can be incorporated in a hardware based firewall suitable for use in portable computing devices such as cellular telephones and wireless connected PDAs adapted to connect to the Internet. The invention performs dynamic packet filtering on packets received over an input packet stream. The dynamic filter checks dynamic protocol behavior using information extracted from the received packet. Sessions are created and stored in a session database to track the state of communications between the source and destination. Recognition of a session is accelerated by use of a hash table to quickly determine the corresponding session record in the session database. Session related data is read from the session database and the received packet is checked against a set of rules to determine whether to allow or deny the packet.
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