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What is SSH ProxyJump?
ProxyJump is the simplified way to use a feature that ssh has had for a long time: ProxyCommand . ProxyCommand works by forwarding standard in (stdin) and standard out (stdout) from the remote machine though the proxy or bastion hosts.
What can be done through SSH?
With these basics, let’s start with 6 things you can do with SSH.
- SFTP. I want to access files stored on my server without installing anything extra.
- Keep Alive. My firewall keeps shutting down my connection!
- SSH Agent.
- Tunneling via Local Port Forwarding.
- X11 Forwarding.
- ProxyJump.
How do I use jump host SSH?
The simplest way to connect to a target server via a jump host is using the -J flag from the command line. This tells ssh to make a connection to the jump host and then establish a TCP forwarding to the target server, from there (make sure you’ve Passwordless SSH Login between machines).
How does ssh connect to a jump host?
This tells ssh to make a connection to the jump host and then establish a TCP forwarding to the target server, from there (make sure you’ve Passwordless SSH Login between machines). If usernames or ports on machines differ, specify them on the terminal as shown.
What can I do with proxyjump in OpenSSH?
ProxyJump is a new addition to OpenSSH which simplifies using jump hosts. This is used as an additional layer of security for machines that you don’t want to have exposed publicly.
How to SSH to another proxy server in Linux?
In this tutorial we learned about different methods to SSH a Linux box using another proxy server or to transfer files using SCP via another proxy server or jump host. You can use either ProxyCommand or ProxyJump with ssh and scp respectively to ssh through any proxy service such as squid or any other proxy server.
How to transfer files via proxy in OpenSSH?
With openssh package version 7.4p1-11 or later, we can use ProxyJump option to transfer files using a proxy server. The syntax of the scp command to transfer files via proxy is :