Pmc-sierra, Inc.

Subhash Bal

Sundar Iyer

Raghunath Iyer

Ramana Rao

As Internet packet flow increases, the demand for high speed packet filtering has grown. The present invention introduces several methods for a high-speed rule processing. The methods are geared towards Internet Protocol (IP) packet processing.

Method and apparatus for high-speed network rule processing

A method and apparatus for performing network address translation is disclosed. The method generates statistically unique port number for each outgoing connection. The statistically unique port numbers are formed from a subset of bits from the source node's IP address and a subset of bits from the port number assigned by the source node. The statistically unique port number is used as an index into a table containing connection information. When a statistically unique port number fails to be absolutely unique, the method uses a secondary fallback system that generates a unique port number by using sequential numbering system. The information about the connections using unique port numbers that were generated sequentially is stored in a secondary connection table. The secondary connection table is organized as a Patricia tree.

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Calabasas, CA, United States of America

Subhash Bal