Surf these sites: Linuxberg Console Administration - Firewall / Security -- a listing of programs to help setup and maintain firewalls and for all around security on a Linux box, by Tucows.Com Inc. SINUS Firewall -- A TCP/IP packet filter for Linux. Supports stateful inspection of TCP communications, dynamic rules, prevention of packet and address spoofing, alerting, and counter intelligence. [GPL] ipchains -- The utility is the user-space portion of the Linux packet filter code, since kernel 2.1.102. [GPL]
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