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IPTables

Deny traffic to ports except for Local Loopback¶

iptables -A INPUT -p tcp --destination-port 13327 ! -d $ip -j DROP
iptables -A INPUT -p tcp --destination-port 9991 ! -d $ip -j DROP

Clear ALL IPTables firewall rules¶

iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -t nat -F
iptables -t mangle -F
iptables -F
iptables -X
iptables -t raw -F iptables -t raw -X