How to Set Up an SSH Jump Server

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https://goteleport.com/blog/ssh-jump-server/

What is an SSH Jump Server?

An SSH jump server is a regular Linux server, accessible from the Internet, which is used as a gateway to access other Linux machines on a private network using the SSH protocol. Sometimes an SSH jump server is also called a “jump host” or a “bastion host”. The purpose of an SSH jump server is to be the only gateway for access to your infrastructure reducing the size of any potential attack surface. Having a dedicated SSH access point also makes it easier to have an aggregated audit log of all SSH connections.

Why not call it an SSH proxy? Partly due to historical reasons. In the earlier days of SSH, users had to SSH into a jump host and from there, they had to type ssh again to “jump” to a destination host. Today, this is done automatically using the ProxyJump option.