Firewall types Straight packet filter Allow actual packets outbound, with address re-writing if necessary Application Gateways, Stateful Packet Filters, Proxies, etc Re-write and potentially sanitise the data being sent Packets may be created from the device's native IP stack, and loose original trickery.
Copyright 2003, Bri Hatch of Onsight, Inc.
Presented at SecureWorld Expo, 2003.
Presentation created using vim and MagicPoint.