I was recently browsing through the 1992 copyrighted edition
of_Interconnections: Bridges and Routers_ by Radia Perlman when I
stumbled upon an interesting definition of a firewall. Radia writes:
"With most networks, malfunctions can cause widespread disruption.
Some networks, however, are designed with ''firewalls.'' If a network
is partitioned into pieces by firewalls, a disruption will spread only
as far as a firewall and will therefore affect only a portion of the
So, my curiosity was perked into wondering whether firewalls
originally filled this purpose before they became more orientated to
protecting networks or whether this was simply a competing definition.
Any definitive answers or good guesses?
In a general sense though, I would think that this definition isn't
truly in conflict with what we call "firewalls" today seeing as how
security incidents can be easily classified as disruptions. These days,
I think we could probably even get away with classifying most of the
Internet as a disruption..
Bruce K. Marshall, CISSP - bkmarsh @
com - Feist Communications
"Specialists in using today's advanced communications technology
to ensure the future of your business."