What Is a Bastion Host (Jump Box)? Secure Remote Access Explained

Introduction: The Secure Entryway

If your servers are safely hidden in a Private Subnet without public IP addresses, how do you, as the IT Admin, log in to fix them? You can't reach them directly. You must use a Bastion Host (often called a 'Jump Box').

The Digital Air Lock

A Bastion Host is a tiny, incredibly hardened server that sits in the Public Subnet. It has one job: accept your secure SSH or RDP connection from the outside world. Once you log into the Bastion, you are 'Inside' the network. From there, you can 'Jump' to the private IP addresses of your databases.

Conclusion

The Bastion Host narrows the attack surface. By funneling all administrative access through one highly monitored IP, you keep the rest of your fleet invisible to the world. Audit your administrative ports here.