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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.

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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
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

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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.