Firewall Turns 25 This Month

By Ionut Ilascu

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Back in 1989, the first firewall was introduced by the AT&T Bell Labs. It performed stateful packet inspection based on technology developed by engineers from Digital Equipment Corporation (DEC) a year before.

However, things are not as clear as they appear as far as the father of the firewall is concerned because many researchers have contributed to what evolved into today’s network security solution that offers protection both as a software and as a hardware-based system.

One thing is certain, though, the concept and the technology, no matter how rudimentary, were introduced in the late ‘80s.

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