Create /etc/nginx/cloudflare-allow.conf
# https://www.cloudflare.com/ips
# IPv4
allow 199.27.128.0/21;
allow 173.245.48.0/20;
allow 103.21.244.0/22;
allow 103.22.200.0/22;
allow 103.31.4.0/22;
allow 141.101.64.0/18;
allow 108.162.192.0/18;
allow 190.93.240.0/20;
allow 188.114.96.0/20;
allow 197.234.240.0/22;
allow 198.41.128.0/17;
allow 162.158.0.0/15;
# IPv6
allow 2400:cb00::/32;
allow 2606:4700::/32;
allow 2803:f800::/32;
allow 2405:b500::/32;
allow 2405:8100::/32;Then in your /etc/nginx/sites-available/site.com add:
server {
listen 80; ## listen for ipv4; this line is default and implied
listen [::]:80 default ipv6only=on; ## listen for ipv6
include /etc/nginx/cloudflare-allow.conf;
deny all;
server_name direct.site.com www.site.com site.com;
#...the rest of your config here...
}