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icon Security Basics

Brief History of Check Point Firewalls

At the beginning of things

The idea of filtering traffic between different networks is as old as routing itself.  Most routers are capable of enforcing so-called “access lists” to define basic inter-network communication restrictions.

The first paper describing network packet filtering was published by Digital Equipment Corporation (DEC) in 1988.  In 1992 DEC presented the very first commercial firewall: DEC SEAL.  Early firewalls such as SEAL checked network addresses and sometimes the port numbers of a packet to determine whether that packet could be forwarded or should be discarded.  This type of inspection is called Static Packet Filtering (SPF).




Figure 1: Static Filtering Enforcement - OSI Model


As shown on the diagram above, SPF acts on Layers 3 and 4 of OSI Networking Model.  Its security decision is based on IP addresses and in some cases ports of IP packets.


Although packet filtering’s logic is very simple, is has a fundamental

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