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In order to ssh directly to an epp-theory machine from outside the SLAC network without having to do the two-step procedure explained above, one can setup a proxyJump through the gateway machines.
To do so, edit (or create if not present) the ssh configuration file (, which is usually found in .ssh/config on a Linux machine) , on the computer from which you want to connect and add the following lines
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Note that since ssh is at the basis of other secure commands like scp, this setup allows one to copy from to the epp-theory machines with the simple
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