[fw-wiz] Recommended Open Source Proxy Firewalls

Hi,
I just finished reading Marcus Ranum's very interesting paper -
http://www.ranum.com/security/computer_security/editorials/deepinspect/index.html
- comparing "deep packet inspection firewalls" with "proxy firewalls"
and was interested in investigating open source "proxy firewalls". Do
open source proxy firewalls even exist, and if so, which would you
recommend and why? Thank you for your help.
--
Mathew Brown
mathewbrown@xxxxxxxxxxx

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