Evolution of the firewall
What are the differences and similarities between the original firewalls and
current firewalls?
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Michael S. Mimoso, Editorial Director
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
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This was first published in August 2001