Centos extremely secure iptables setup -

Centos extremely secure iptables setup

If you want to make sure only a certain IP can access your server for any service or protocol here is a way to do it (just be sure you have access to the IP(s) mentioned or you will be locked out).

 

iptables -F
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A INPUT -p tcp -s IP.IP.IP.IP -j ACCEPT

iptables -A INPUT -j DROP
service iptables save


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