Definition
It is a system identified by firewall administrator as critical strong point in network security. A bastion host is a computer that is fully exposed to attack. The system is on the public side of the demilitarized zone (DMZ), unprotected by a firewall or filtering router. Frequently the roles of these systems are critical to the network security system. Indeed the firewalls and routers can be considered bastion hosts. Due to their exposure a great deal of effort must be put into designing and configuring bastion hosts to minimize the chances of penetration. Other types of bastion hosts include web, mail, DNS, and FTP servers.
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