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Packet FilterPacket filters are host-based or appliance-based applications, which block or allow network traffic based on a set of rules defined by the administrator. Commonly used packet filters are ipf, ipfw or pf for Unix and iptables or ipchains for Linux. The administrator starts the packet filtering process on the device, composes the set of rules to which the incoming network traffic should be applied and those rules either permit or deny the traffic based upon those rules. Modern packet filters can filter traffic based on many packet attributes like source IP, source port, destination IP or port, destination service like WWW or FTP. They can filter based on protocols, TTL values, netblock of originator, domain name of the source, and many other attributes. External links *An Excellent FreeBSD Security How-to
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