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This document contains an overview of recent developments in firewall technology, and guidance on configuring firewall environments. It discusses firewall access control, active content filtering, DMZs, and co-location with VPNs, web and email servers, and intrusion detection. It contains guidance on developing firewall policy and recommendations for administering firewalls. Lastly, it contains several appendices with links to other firewall-related resources and recommendations for configuring and operating firewalls.
