Another SSH trick

Ever have a machine you can only ssh into through another machine? It’s a very common situation in the Technion. Here’s one way to get around it: Assume you can directly ssh into alpha, and from alpha you can ssh into beta. Have the following code in your ~/.ssh/config:

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Host beta
        Hostname 1.2.3.4  # IP Address of beta
        ProxyCommand ssh alpha nc -w 1 %h %p

This requires you to have nc (netcat) installed on alpha. Once you do that, you can run ssh beta directly from your own box.