Improved packet filtering for data networks

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01) H04L 12/46 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2169181

An improved partial packet filter (10) for filtering data packets (210) in a computer network (12) wherein a candidate field (413) of the data packet (210) is hashed to a plurality of bit-wise subsets (636) each being an independent representation of the candidate field (413). Each of the bit-wise subsets (636) is compared to a reference hash table (644) which has been prepared in a preliminary operation series (514). The preliminary operation series (512) configures a plurality of target fields (714) to set selected memory locations (312) in the reference hash table (644).

Nouveau filtre partiel (10) pour le filtrage de paquets de données (210) dans un réseau informatique (12), selon lequel un champ candidat (413) du paquet de données considérées (210) est haché en une série de sous-ensembles à configuration binaire (636) dont chacun est une représentation indépendante du champ candidat (413). Chacun des sous-ensembles à configuration binaire (636) est comparé à une table de référence de hachage (644) élaborée dans le cadre d'une série préliminaire d'opérations (514). Cette série préliminaire d'opérations (512) configure une pluralité de champs cibles (714) permettant de définir certains emplacements de mémoire (312) dans la table de référence de hachage (644).

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