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Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
A bastion host is a security firewall that protects an internal network from attacks that come from external networks. A firewall may separate one department network from another, or an enterprise network from the Internet. The bastion host is the main point of contact to the outside and so is the most vulnerable system.
The Firewall topic provides more details.
Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.