1、卸載firewalld
yum -y remove firewalld
2、安裝iptables
yum install -y iptables
3、編寫iptables規則
# vi /etc/iptables.sh
#!/bin/sh
#declare variables
IPTABLES=/usr/sbin/iptables
ETHI=eth0
ETHO=eth1
#clear all policy
$IPTABLES -F
#the policies for loopback
$IPTABLES -A INPUT -i lo -j ACCEPT
$IPTABLES -A OUTPUT -o lo -j ACCEPT
#the policies for private network
$IPTABLES -A INPUT -i $ETHI -s 10.173.3.29 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.173.10.188 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.173.10.145 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.173.28.173 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.162.211.124 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.173.11.107 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.162.208.176 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.3.29 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.10.188 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.10.145 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.28.173 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.162.211.124 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.11.107 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.162.208.176 -j ACCEPT
#the policies for monitor
$IPTABLES -A INPUT -i $ETHI -s 10.242.174.13 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.242.174.13 -j ACCEPT
#for DNS request
$IPTABLES -A INPUT -i $ETHI -p udp -s 10.202.72.118 --sport 53 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p udp -s 10.202.72.116 --sport 53 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -p udp -d 10.202.72.118 --dport 53 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -p udp -d 10.202.72.116 --dport 53 -j ACCEPT
#the policies for public network
$IPTABLES -A OUTPUT -o $ETHO -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p icmp -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p tcp --dport 25234 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p tcp --dport 80:88 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p tcp --dport 443 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p tcp -s 101.36.94.174 --dport 1055 -j ACCEPT
#the logs recode
$IPTABLES -A INPUT -i $ETHI -p tcp -j LOG --log-prefix "IPTABLES TCP-IN: "
$IPTABLES -A INPUT -i $ETHI -p udp -j LOG --log-prefix "IPTABLES UDP-IN: "
$IPTABLES -A OUTPUT -o $ETHO -p tcp -j LOG --log-prefix "IPTABLES TCP-OUT: "
$IPTABLES -A OUTPUT -o $ETHO -p udp -j LOG --log-prefix "IPTABLES UDP-OUT: "
#all the other requests will be drop
$IPTABLES -A INPUT -j DROP
$IPTABLES -A FORWARD -j DROP
$IPTABLES -A OUTPUT -j DROP
# chmod +x /etc/iptables.sh
4、創建iptable日誌記錄文件
# touch /var/log/iptable.log
# vi /etc/rsyslog.conf 在最後一行添加
kern.warning /var/log/iptables.log
# systemctl restart rsyslog