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<p>Your browser doesn't support frames Please upgrade your browser to take advantage of all features of <a href="http://firewall.com/" target="_top">www.firewall.com</a>. </p> <p>Click on the link to proceed to <a href="http://firewall.com/papers/packet_filt_chapman.ps.gz" target="_top">Network (In)Security Through IP Packet Filtering</a> - Chapman, D. Brent; 1992; GZip'd Postscript; 46k ``Why packet filtering is a difficult to use and not always secure method of securing a network.