Bastion Host
Security
A bastion host is typically a firewall implemented on top of an operating system that has been specially configured and hardened to be resistant to attack.
Telecommunications
1. A host computer that, in a screened subnetwork, performs the functions of a firewall. Synonym screened-host gateway. [2382-pt.35] 2. A computer system that must be highly secured because it is vulnerable to attack, usually because it is exposed to the Internet and is a main point of contact for users of internal networks. It gets its name from the highly fortified projects on the outer walls of medieval castles.