Extending Firewall Session Table to Accelerate NAT, QoS Classification and Routing

security and QoS are the two most precious objectives for network systems to be attained. Unfortunately, they are in conflict, while QoS tries to minimize processing delay, strong security protection requires more processing time and cause packet delay. This article is a step towards resolving this conflict by extending the firewall session table to accelerate NAT, QoS classification, and routing processing time while providing the same level of security protection. Index Terms — stateful packet filtering; firewall; session/state table; QoS; NAT; Routing.