Restrict SSH Using IpTables

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Well, it's not as hard as it seems:

iptables -D INPUT -m tcp -p tcp --dport 22 -j DROP
iptables -A INPUT -m tcp -p tcp --dport 22 --source {ip-address-goes-here} -j ACCEPT
iptables -A INPUT -m tcp -p tcp --dport 22 -j DROP

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