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53cur!ty 6109

Girma Nigusse

Making your Linux installation (more) malware-proof

June 30, 2006

Improving the security odds for an already-strong OS

Scott Spanbauer

The first reason your Linux system is probably safe from attack: Recent versions of Linux (kernels 2.4 and 2.6) include a built-in firewall called "iptables" that simply drops all uninvited incoming connections by default. If a worm or a person tries to break into your Linux box from afar, or not so afar, iptables simply turns away and ignores the incoming connection -- the attacker won't know whether a system even exists at the attacked address.

Source: http://www.computerworld.com/

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