SSH: Use Gateway/Jumphost

Host unreachable_host
  ProxyCommand ssh -e none gateway_host exec nc %h %p
ssh -J Jumphost FooServer
ssh -J Jumphost vivek@FooServer
ssh -J hello.vpn.cyberciti.biz www.nixcraft.com
ssh -J hello.vpn.cyberciti.biz:22 vivek@www.nixcraft.com

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