CentOS

yum -y install iptables-services

service iptables save

否则

iptables-save > /etc/sysconfig/iptables

iptables-restore < /etc/iptables/rules.v4

Ubuntu

apt-get install iptables -y                # OS >= 20版本用:apt-get install iptables-persistent -y

iptables-save > /etc/iptables/rules.v4 # 保存规则

iptables-restore < /etc/iptables/rules.v4 # 还原规则

添加规则(测试):

iptables -A INPUT -p udp -m udp --dport 53 -j DROP

iptables -I INPUT -p udp -m udp --dport 53 -d 127.0.0.1/32 -j ACCEPT

IPV6:

Debian/Ubuntu: ip6tables-save > /etc/iptables/rules.v6

RHEL/CentOS: ip6tables-save > /etc/sysconfig/ip6tables

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