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# to generate your dhparam.pem file, run in the terminal | |
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048 |
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# Source: | |
# https://www.cloudflare.com/ips | |
# https://support.cloudflare.com/hc/en-us/articles/200169166-How-do-I-whitelist-CloudFlare-s-IP-addresses-in-iptables- | |
for i in `curl https://www.cloudflare.com/ips-v4`; do iptables -I INPUT -p tcp -m multiport --dports http,https -s $i -j ACCEPT; done | |
for i in `curl https://www.cloudflare.com/ips-v6`; do ip6tables -I INPUT -p tcp -m multiport --dports http,https -s $i -j ACCEPT; done | |
# Avoid racking up billing/attacks | |
# WARNING: If you get attacked and CloudFlare drops you, your site(s) will be unreachable. | |
iptables -A INPUT -p tcp -m multiport --dports http,https -j DROP |