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Evolution of the firewall

What are the differences and similarities between the original firewalls and current firewalls?


The paper at the link below is a little bit dated, but still provides a decent history of both the evolution of firewalls and an explanation of how they work. Thanks to Cisco for making the paper available.

http://www.cisco.com/univercd/cc/td/doc/product/iaabu/centri4/user/scf4ch3.htm
This was last published in August 2001

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