iptables 实例

开启ip段192.168.1.0/24端的80口

开启ip段211.123.16.123/24端ip段的80口

# iptables -I INPUT -p tcp --dport 80 -j DROP

# iptables -I INPUT -s 192.168.1.0/24 -p tcp --dport 80 -j ACCEPT

# iptables -I INPUT -s 211.123.16.123/24 -p tcp --dport 80 -j ACCEPT

以上是临时设置。

1.先备份iptables

# cp /etc/sysconfig/iptables /var/tmp

2.然后保存iptables

# service iptables save

3.重启防火墙

#service iptables restart

以下是端口，先全部封再开某些的IP

iptables -I INPUT -p tcp --dport 9889 -j DROP

iptables -I INPUT -s 192.168.1.0/24 -p tcp --dport 9889 -j ACCEPT

如果用了NAT转发记得配合以下才能生效

iptables -I FORWARD -p tcp --dport 80 -j DROP

iptables -I FORWARD -s 192.168.1.0/24 -p tcp --dport 80 -j ACCEPT

常用的IPTABLES规则如下：

只能收发邮件，别的都关闭

iptables -I Filter -m mac --mac-source 00:0F:EA:25:51:37 -j DROP

iptables -I Filter -m mac --mac-source 00:0F:EA:25:51:37 -p udp --dport 53 -j ACCEPT

iptables -I Filter -m mac --mac-source 00:0F:EA:25:51:37 -p tcp --dport 25 -j ACCEPT

iptables -I Filter -m mac --mac-source 00:0F:EA:25:51:37 -p tcp --dport 110 -j ACCEPT

IPSEC NAT 策略

iptables -I PFWanPriv -d 192.168.100.2 -j ACCEPT

iptables -t nat -A PREROUTING -p tcp --dport 80 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:80

iptables -t nat -A PREROUTING -p tcp --dport 1723 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:1723

iptables -t nat -A PREROUTING -p udp --dport 1723 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:1723

iptables -t nat -A PREROUTING -p udp --dport 500 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:500

iptables -t nat -A PREROUTING -p udp --dport 4500 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:4500

FTP服务器的NAT

iptables -I PFWanPriv -p tcp --dport 21 -d 192.168.100.200 -j ACCEPT

iptables -t nat -A PREROUTING -p tcp --dport 21 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.200:21

只允许访问指定网址

iptables -A Filter -p udp --dport 53 -j ACCEPT

iptables -A Filter -p tcp --dport 53 -j ACCEPT

iptables -A Filter -d www.3322.org -j ACCEPT

iptables -A Filter -d img.cn99.com -j ACCEPT

iptables -A Filter -j DROP

开放一个IP的一些端口，其它都封闭

iptables -A Filter -p tcp --dport 80 -s 192.168.100.200 -d www.pconline.com.cn -j ACCEPT

iptables -A Filter -p tcp --dport 25 -s 192.168.100.200 -j ACCEPT

iptables -A Filter -p tcp --dport 109 -s 192.168.100.200 -j ACCEPT

iptables -A Filter -p tcp --dport 110 -s 192.168.100.200 -j ACCEPT

iptables -A Filter -p tcp --dport 53 -j ACCEPT

iptables -A Filter -p udp --dport 53 -j ACCEPT

iptables -A Filter -j DROP

多个端口

iptables -A Filter -p tcp -m multiport --destination-port 22,53,80,110 -s 192.168.20.3 -j REJECT

连续端口

iptables -A Filter -p tcp -m multiport --source-port 22,53,80,110 -s 192.168.20.3 -j REJECT iptables -A Filter -p tcp --source-port 2:80 -s 192.168.20.3 -j REJECT

指定时间上网

iptables -A Filter -s 10.10.10.253 -m time --timestart 6:00 --timestop 11:00 --days Mon,Tue,Wed,Thu,Fri,Sat,Sun -j DROP

iptables -A Filter -m time --timestart 12:00 --timestop 13:00 --days Mon,Tue,Wed,Thu,Fri,Sat,Sun -j ACCEPT

iptables -A Filter -m time --timestart 17:30 --timestop 8:30 --days Mon,Tue,Wed,Thu,Fri,Sat,Sun -j ACCEPT

禁止多个端口服务

iptables -A Filter -m multiport -p tcp --dport 21,23,80 -j ACCEPT

将WAN 口NAT到PC

iptables -t nat -A PREROUTING -i $INTERNET_IF -d $INTERNET_ADDR -j DNAT --to-destination 192.168.0.1

将WAN口8000端口NAT到192。168。100。200的80端口

iptables -t nat -A PREROUTING -p tcp --dport 8000 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.200:80

MAIL服务器要转的端口

iptables -t nat -A PREROUTING -p tcp --dport 110 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.200:110

iptables -t nat -A PREROUTING -p tcp --dport 25 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.200:25

只允许PING 202。96。134。133,别的服务都禁止

iptables -A Filter -p icmp -s 192.168.100.200 -d 202.96.134.133 -j ACCEPT

iptables -A Filter -j DROP

禁用BT配置

iptables –A Filter –p tcp –dport 6000:20000 –j DROP

禁用QQ防火墙配置

iptables -A Filter -p udp --dport ! 53 -j DROP

iptables -A Filter -d 218.17.209.0/24 -j DROP

iptables -A Filter -d 218.18.95.0/24 -j DROP

iptables -A Filter -d 219.133.40.177 -j DROP

基于MAC，只能收发邮件，其它都拒绝

iptables -I Filter -m mac --mac-source 00:0A:EB:97:79:A1 -j DROP

iptables -I Filter -m mac --mac-source 00:0A:EB:97:79:A1 -p tcp --dport 25 -j ACCEPT

iptables -I Filter -m mac --mac-source 00:0A:EB:97:79:A1 -p tcp --dport 110 -j ACCEPT

禁用MSN配置

iptables -A Filter -p udp --dport 9 -j DROP

iptables -A Filter -p tcp --dport 1863 -j DROP

iptables -A Filter -p tcp --dport 80 -d 207.68.178.238 -j DROP

iptables -A Filter -p tcp --dport 80 -d 207.46.110.0/24 -j DROP

只允许PING 202。96。134。133 其它公网IP都不许PING

iptables -A Filter -p icmp -s 192.168.100.200 -d 202.96.134.133 -j ACCEPT

iptables -A Filter -p icmp -j DROP

禁止某个MAC地址访问internet:

iptables -I Filter -m mac --mac-source 00:20:18:8F:72:F8 -j DROP

禁止某个IP地址的PING:

iptables –A Filter –p icmp –s 192.168.0.1 –j DROP

禁止某个IP地址服务：

iptables –A Filter -p tcp -s 192.168.0.1 --dport 80 -j DROP

iptables –A Filter -p udp -s 192.168.0.1 --dport 53 -j DROP

只允许某些服务，其他都拒绝(2条规则)

iptables -A Filter -p tcp -s 192.168.0.1 --dport 1000 -j ACCEPT

iptables -A Filter -j DROP

禁止某个IP地址的某个端口服务

iptables -A Filter -p tcp -s 10.10.10.253 --dport 80 -j ACCEPT

iptables -A Filter -p tcp -s 10.10.10.253 --dport 80 -j DROP

禁止某个MAC地址的某个端口服务

iptables -I Filter -p tcp -m mac --mac-source 00:20:18:8F:72:F8 --dport 80 -j DROP

禁止某个MAC地址访问internet:

iptables -I Filter -m mac --mac-source 00:11:22:33:44:55 -j DROP

禁止某个IP地址的PING:

iptables –A Filter –p icmp –s 192.168.0.1 –j DROP