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More details are available here.
SSH via proxyJumpproxyJump
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To do so, edit (or create if not present) the ssh configuration file (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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From an authentication point of view this will work on any machine that can ssh to your-slac-username@rhel6-64.slac.stanford.edu.\
If you want to ssh also to epp-theory02 or epp-theory03 you can add multiple blocks like the one above to your config file, just change the host and the hostname entries accordingly.
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