Allow only CloudFlare CDN IPs

sudo apt-get install ipset
ipset create cf hash:net
#Now populate the set with CloudFlare IP ranges:
for x in $(curl; do ipset add cf $x; done
#You can use the 'cf' set now in a iptables rule like so:
iptables -A INPUT -m set --match-set cf src -p tcp -m multiport --dports http,https -j ACCEPT
#Disallow direct connecting to your server IP:
iptables -A INPUT -p tcp --dport http -j DROP
iptables -A INPUT -p tcp --dport https -j DROP


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