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.