Configure iptables for CloudFlare

IPTABLES: Only Allow CloudFlare to Access Your Server's HTTP(s) Ports

Note: These are command line instructions

for i in `curl`; do iptables -I INPUT -p tcp -s $i --dport http -j ACCEPT; done  
for i in `curl`; do iptables -I INPUT -p tcp -s $i --dport https -j ACCEPT; done  
iptables -A INPUT -p tcp --dport http -j DROP  
iptables -A INPUT -p tcp --dport https -j DROP  

And to re-allow connections from anywhere:

iptables -A INPUT -p tcp --dport http -j ACCEPT  
iptables -A INPUT -p tcp --dport https -j ACCEPT  

P.S. This is only for IPv4.

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