centos iptables设定

##save as /etc/sysconfig/iptables,then /etc/init.d/iptables restart |start 

# Firewall configuration written by redhat-config-securitylevel 

*filter 

:INPUT DROP [0:0] 

:FORWARD ACCEPT [0:0] 

:OUTPUT ACCEPT [0:0] 

:RH-Firewall-1-INPUT - [0:0] 

-A INPUT -j RH-Firewall-1-INPUT 

-A FORWARD -j RH-Firewall-1-INPUT 

-A RH-Firewall-1-INPUT -i lo -j ACCEPT 

-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT 

-A RH-Firewall-1-INPUT -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP 

-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT 

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT 

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 2222 -j ACCEPT 

# 

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT 

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT 

# 

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT 

# 

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 8081 -j ACCEPT 

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 8088 -j ACCEPT 

# 

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 53 -j ACCEPT 

-A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 53 -j ACCEPT 

# 

-A RH-Firewall-1-INPUT -s  xxx.xxx.xxx.xxx -j ACCEPT 

# 

-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp -s  --dport 6666 -j ACCEPT 

-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp -s xxx.xxx.xxx.xxx --dport port1 -j ACCEPT 

# 

# 

-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited 

COMMIT 

#

其实建议用以下方式添加相关规则并生效:

iptables -t nat -A POSTROUTING -s 10.1.1.1/24  -j MASQUERADE

#以上规则会更新至[/etc/sysconfig/iptables]文件

/etc/init.d/iptables save