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For questions on connecting devices together so that they can communicate with each other, as well as questions on networking equipment such as routers and switches.

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From http://www.linuxquestions.org/questions/linux-newbie-8/how-to-configure-ssh-to-allow-or-deny-specify-host-ip-address-610246/ Add sshd: 116.31.116.20 to /etc/hosts.deny
answered Jun 21 '16 by Cameron