ssh: ssh a remote host via a bastion

Source: SSH ProxyCommand example: Going through one host to reach another server

In order to reach remote1 through a bastion host, add the following lines in your .ssh/config:

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Host bastion HostName bastion-01.golgoth.com User jgallinari   Host remote1 HostName remote1.toto.swir User jgallinari ProxyCommand ssh jgallinari@bastion -W %h:%p

Then ssh remote1 should do it.