Stateful Inspection, invented by Check Point Software Technologies, has emerged as the industry standard for enterprise-class network security solutions. Stateful Inspection is able to meet all the security requirements defi ned above while traditional fi rewall technologies, such as packet fi lters and application-layer gateways, each fall short in some areas. With Stateful Inspection, packets are intercepted at the network layer for best performance (as in packet fi lters), but then data derived from all communication layers is accessed and analyzed for improved security (compared to layers 4–7 in application-layer gateways). Stateful Inspection then introduces a higher level of security by incorporating communication- and application-derived state and context information which is stored and updated dynamically. This provides cumulative data against which subsequent communication attempts can be evaluated. It also delivers the ability to create virtual session information for tracking connectionless protocols (for example, RPC and UDP-based applications), something no other firewall technology can accomplish.
Ref - www.checkpoint.com
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