This paper is meant to provide techniques in building and installing a standalone packet filtering firewall in Linux machines, mainly for small sites who don't give much service to Internet users. It deals with attenuating the effect of the most common types of attacks using ipchains. It guides how to design, implement, debug, and maintain Firewall. Techniques for continuously monitoring attacks is attempted. It also give a historical, architectural and technical overview of firewalls and security attacks.
Note: M.Sc. thesis
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