White Papers

Real Stateful TCP Packet Filtering in IP Filter

Overview IP Filter is an Open Source packet filtering engine that is available for a number of operating systems, including Solaris and FreeBSD, Open-BSD and NetBSD. IP Filter comes with so-called stateful packet filtering. In the case of TCP, the state engine not only inspects the presence of ACK flags, or looks at source and destination ports, but it includes sequence numbers and window sizes in its decision to pass or block packets. This greatly reduces the window of opportunity for malicious packets to be passed through the packet filter, even in the case when source and destination ports and addresses are known.

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Publisher: Administration and Network Engineering
File Format: PDF
Date Published: Dec 21, 2007
Format: White Papers
Topics: TCP - IP

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