Jumphost - Undying Terminal

When to use a jumphost

Use a jumphost (bastion host) when your target machine is only reachable from a private network, but you have SSH access to an internet-reachable host inside (or adjacent to) that network.

Basic SSH jump

Use OpenSSH’s jump option:

ssh -J user@jumphost user@target

If you need a non-standard port for the jumphost:

ssh -J user@jumphost:2222 user@target

Recommended SSH config

Add host aliases to ~/.ssh/config:

Host bastion
  HostName jumphost.example.com
  User user

Host target
  HostName 10.0.0.10
  User user
  ProxyJump bastion

Then connect with:

ssh target

Notes

If you also need port forwarding, see the Port forwarding guide.
If your connection is unstable, Undying Terminal’s session persistence helps you avoid losing long-running commands when the underlying SSH transport drops.