我设置了 80 和 443 端口只运行白名单 IP 访问，但是发现没有用，实际上任何 IP 都能访问。然后我又测试删除 80 端口的 INPUT 规则，之后依然能访问。明明有 -A INPUT -j DROP。但是 Ben IP 又正常生效 -A INPUT -s 120.26.72.89/32 -j DROP。

    -A INPUT -i lo -j ACCEPT     -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT     -A INPUT -p icmp -j ACCEPT     -N whitelist     -A whitelist -s 103.21.244.0/22 -j ACCEPT     -A whitelist -s 103.22.200.0/22 -j ACCEPT     -A whitelist -s 103.31.4.0/22 -j ACCEPT     -A whitelist -s 104.16.0.0/12 -j ACCEPT     -A whitelist -s 108.162.192.0/18 -j ACCEPT     -A whitelist -s 131.0.72.0/22 -j ACCEPT     -A whitelist -s 141.101.64.0/18 -j ACCEPT     -A whitelist -s 162.158.0.0/15 -j ACCEPT     -A whitelist -s 172.64.0.0/13 -j ACCEPT     -A whitelist -s 173.245.48.0/20 -j ACCEPT     -A whitelist -s 188.114.96.0/20 -j ACCEPT     -A whitelist -s 190.93.240.0/20 -j ACCEPT     -A whitelist -s 197.234.240.0/22 -j ACCEPT     -A whitelist -s 198.41.128.0/17 -j ACCEPT     -A whitelist -s 199.27.128.0/21 -j ACCEPT     -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j whitelist     -A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j whitelist     -A INPUT -j DROP     -A FORWARD -j DROP     -A OUTPUT -j ACCEPT