#!/bin/bash#本机网卡名network=eth0#清空规则/sbin/iptables -F#允许外部主机建立22/80/443/10022端口连接/sbin/iptables -A INPUT -i $network -p tcp -m multiport \--dports 22,80,443,10022 -m state --state NEW,ESTABLISHED -j ACCEPT/sbin/iptables -A OUTPUT -o $network -p tcp -m multiport \--sports 22,80,443,10022 -m state --state ESTABLISHED -j ACCEPT#允许指定主机访问3306端口/sbin/iptables -A INPUT -i $network -p tcp -s 192.168.100.0/24 \--dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT/sbin/iptables -A OUTPUT -o $network -p tcp --sport 3306 -m state \--state ESTABLISHED -j ACCEPT#允许lo访问/sbin/iptables -A INPUT -i lo -j ACCEPT/sbin/iptables -A OUTPUT -o lo -j ACCEPT#允许外部主机ping内部主机/sbin/iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT/sbin/iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT#允许内部主机ping外部主机/sbin/iptables -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT/sbin/iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT#防止DOS***/sbin/iptables -A INPUT -p tcp --dport 80 -m limit --limit 50/minute --limit-burst 100 -j ACCEPT#–limit 25/minute: 每分钟最多50个连接数#–limit-burst 100: 连接数达到100的时候启用生效#端口转发,使用ssh连接10022会转发到22端口/sbin/iptables -t nat -A PREROUTING -p tcp \-d 192.168.100.254 --dport 10022 -j DNAT --to 192.168.100.254:22#默认规则/sbin/iptables -P INPUT DROP/sbin/iptables -P OUTPUT ACCEPT/sbin/iptables -P FORWARD DROP#允许192.168.110.0/24网段NAT上网/sbin/iptables -t nat -A POSTROUTING -s 192.168.110.0/24 -j SNAT --to 192.168.100.254