Bastion Host

Bastion Host: A specially hardened system serving as a controlled access point to protected networks. This concept shapes security architectureSecurity ArchitectureThe structured design of security controls, trust boundaries, data flows, and operational responsibilities. and systematically reduces opportunities for attacks or lateral movement. ImplementationImplementationThe practical realization of a security design, requirement, or control in a system or process. should be risk-based, documented, tested, and regularly adjusted.

How it works and where it fits

Bastion Host is a preventive, detective, or corrective security control. Its effect depends on where it sits in the architecture, which data and decisions it processes, and how it might be bypassed. A control reduces a defined risk but rarely removes it completely, so it should be combined with additional layers of protection.

Practical security relevance

Before deployment, the objective, ownership, coverage, and expected behavior should be defined. Secure defaults, controlled exceptions, logging, and periodic effectiveness tests matter more than installation alone. Operational metrics should expose both blocked or detected activity and gaps, false alerts, and effects on legitimate business processes.

Related concepts

• Network SegmentationNetwork SegmentationSeparates network segments to control access and limit lateral movement.: Separates network segments to control access and limit lateral movement.
• Privileged Access ManagementPrivileged Access ManagementSecures, monitors, and controls accounts with extensive privileges.: Secures, monitors, and controls accounts with extensive privileges.
• Zero Trust Network AccessZero Trust Network AccessGrants application-specific remote access based on identity, device state, and context.: Grants application-specific remote access based on identity, device state, and context.
• HardeningHardeningReduces the attack surface through secure configuration and the deactivation of unnecessary functions.: Reduces the attack surface through secure configuration and the deactivation of unnecessary functions.