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红旗 Linux

红旗 Linux. 网络安全 ——iptables/NAT. iptables 的使用. 三种功能 包过滤 NAT mangle. iptables—— 包过滤. NAT 表的三条规则链 PREROUTING POSTROUTING OUTPUT. Iptables 命令语法. 语法 iptables [-t table] -[ADC] chain rule-specification [options] 常见参数 -A ：在所选择的链末添加一条或更多规则； -L ：显示所选链的所有规则。 -F ：清空所选链。这等于把所有规则一个个删除；

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红旗 Linux

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  1. 红旗Linux 网络安全 ——iptables/NAT

  2. iptables的使用 • 三种功能 • 包过滤 • NAT • mangle

  3. iptables——包过滤 • NAT表的三条规则链 • PREROUTING • POSTROUTING • OUTPUT

  4. Iptables命令语法 • 语法 • iptables [-t table] -[ADC] chain rule-specification [options] • 常见参数 • -A：在所选择的链末添加一条或更多规则； • -L：显示所选链的所有规则。 • -F：清空所选链。这等于把所有规则一个个删除； • -P：设置链的目标规则；

  5. 案例1——实现SNAT 172.16.80.254/24 192.168.2.254 网络-2 NAT 校园网 172.16.80.1/24 XP 192.168.2.180/24 10.10.25.12

  6. 案例1——实现SNAT • 启动防火墙 • service iptables start • 设置规则 • 清空所有规则 • iptables –F -t nat • 设置SNAT策略 • iptables -t nat -A POSTROUTING -s 172.16.80.0/24 -j SNAT --to 192.168.2.180 • 启动数据包转发功能 • echo 1 > /proc/sys/net/ipv4/ip_forward

  7. 案例2——实现DNAT 172.16.80.254/24 192.168.2.80 网络-2 NAT 172.16.80.1/24 Web Server 192.168.2.180/24

  8. 案例2——实现DNAT • 启动防火墙 • service iptables start • 设置规则 • 清空所有规则 • iptables –F -t nat • 设置DNAT策略 • iptables -t nat -A PREROUTING -p tcp -d 192.168.2.180 --dprot 80 -j DNAT --to 172.16.80.1:80 • 启动数据包转发功能 • echo 1 > /proc/sys/net/ipv4/ip_forward

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