SSH jump host

Joel Bodenmann
Date : March 30, 2020
Categories : Networking
Tags : Networking

Jump hosts are extremely common to manage access to a specific network. A user/device is only able to connect to a certain network by passing through the jump host.

Keep in mind that the user of the jump host is not necessarily the same as the user of the destination.

SSH

Using a jump host with OpenSSH is very easy. The -J parameter can be used to specify a jump host:

ssh -J user@jump-host.com user@desitnation

rsync

The beloved rsync provides the command line option -e to specify a different remote shell:

rsync -avzh -e "ssh -J user@jump-host.com" /path/to/source root@destination:/path/to/destination

SCP

Although being old and and “officially” outdated, SCP is still around. SCP provides the -oProxyJump parameter to specify a jump host:

scp -oProxyJump=user@jump-host.com <files_to_copy> user@destination:<desitnation_path>