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Steve Suehring is the Linux Security Editor for Linux World Magazine and uses firewalls and firewall technologies on a variety of linux systems.
A renowned firewall architect and consultant, Bob Ziegler has worked for such companies as Nokia, collaborating with a router and access groups. He is well known as the author of the two previous editions of Linux Firewalls (0735709009 and 0735710996). Ziegler operates a firewall resource site, www.linux-firewall-tools/linux to share his design skills and evaluations of tools.