Открыть трафик только для IP адресов cloudflare

iptables -I INPUT -p tcp --dport 80 -j DROP

iptables -I INPUT -p tcp --dport 443 -j DROP

wget -O - https://www.cloudflare.com/ips-v4 | while read subnet; do iptables -I INPUT -s $subnet -j ACCEPT; done

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