centos iptables 使用及設定

來源:互聯網
上載者:User

常用命令

service iptables [save|start|restart|stop]

iptables -L -n

簡單shell命令

iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp -m multiport --destination-port 22,80,8081,10000,9000,3307 -j ACCEPT

重新導向設定

iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -o eth2 -j SNAT --to A.B.C.Diptables -t nat -A POSTROUTING -s 192.168.168.0/24 -o eth2 -j SNAT --to A.B.C.Diptables -t nat -A PREROUTING -s 192.168.100.0/24 -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128iptables -t nat -A PREROUTING -s 192.168.168.0/24 -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 3128service iptables save

 eg:

# Generated by iptables-save v1.4.7 on Sun Aug 5 21:15:37 2012
*filter
:FORWARD ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p tcp --dport 22 -j ACCEPT
-A INPUT -p tcp --dport 8080 -j ACCEPT
-A INPUT -p tcp --dport 9000 -j ACCEPT
-A INPUT -p tcp --dport 10000 -j ACCEPT
-A INPUT -p tcp --dport 3306 -j ACCEPT
-A INPUT -p icmp -j DROP
-A INPUT -j DROP
COMMIT
# Completed on Sun Aug 5 21:15:37 2012
# Generated by iptables-save v1.4.7 on Sun Aug 5 21:15:37 2012
*mangle
:PREROUTING ACCEPT [379:49473]
:INPUT ACCEPT [377:49409]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [360:147434]
:POSTROUTING ACCEPT [360:147434]
COMMIT
# Completed on Sun Aug 5 21:15:37 2012
# Generated by iptables-save v1.4.7 on Sun Aug 5 21:15:37 2012
*nat
:PREROUTING ACCEPT [23:1575]
:POSTROUTING ACCEPT [7:508]
:OUTPUT ACCEPT [7:508]
COMMIT
# Completed on Sun Aug 5 21:15:37 2012

藍色語句是禁用 icmp ,用來防止探測攻擊

深紅色語句很重要,表示除了以上許可的連接埠,其他連接埠都禁用

參考資料:

以下是連接埠,先全部封再開某些的IPiptables -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轉寄記得配合以下才會生效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規則如下:只能收發郵件,別的都關閉iptables -I Filter -m mac --mac-source 00:0F:EA:25:51:37 -j DROPiptables -I Filter -m mac --mac-source 00:0F:EA:25:51:37 -p udp --dport 53 -j ACCEPTiptables -I Filter -m mac --mac-source 00:0F:EA:25:51:37 -p tcp --dport 25 -j ACCEPTiptables -I Filter -m mac --mac-source 00:0F:EA:25:51:37 -p tcp --dport 110 -j ACCEPTIPSEC NAT 策略iptables -I PFWanPriv -d 192.168.100.2 -j ACCEPTiptables -t nat -A PREROUTING -p tcp --dport 80 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:80iptables -t nat -A PREROUTING -p tcp --dport 1723 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:1723iptables -t nat -A PREROUTING -p udp --dport 1723 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:1723iptables -t nat -A PREROUTING -p udp --dport 500 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:500iptables -t nat -A PREROUTING -p udp --dport 4500 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.2:4500FTP伺服器的NATiptables -I PFWanPriv -p tcp --dport 21 -d 192.168.100.200 -j ACCEPTiptables -t nat -A PREROUTING -p tcp --dport 21 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.200:21隻允許訪問指定網址iptables -A Filter -p udp --dport 53 -j ACCEPTiptables -A Filter -p tcp --dport 53 -j ACCEPTiptables -A Filter -d www.3322.org -j ACCEPTiptables -A Filter -d img.cn99.com -j ACCEPTiptables -A Filter -j DROP開放一個IP的一些連接埠,其它都封閉iptables -A Filter -p tcp --dport 80 -s 192.168.100.200 -d www.pconline.com.cn -j ACCEPTiptables -A Filter -p tcp --dport 25 -s 192.168.100.200 -j ACCEPTiptables -A Filter -p tcp --dport 109 -s 192.168.100.200 -j ACCEPTiptables -A Filter -p tcp --dport 110 -s 192.168.100.200 -j ACCEPTiptables -A Filter -p tcp --dport 53 -j ACCEPTiptables -A Filter -p udp --dport 53 -j ACCEPTiptables -A Filter -j DROP多個連接埠iptables -A Filter -p tcp -m multiport --destination-port 22,53,80,110 -s 192.168.20.3 -j REJECT連續連接埠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指定時間上網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 DROPiptables -A Filter -m time --timestart 12:00 --timestop 13:00 --days Mon,Tue,Wed,Thu,Fri,Sat,Sun -j ACCEPTiptables -A Filter -m time --timestart 17:30 --timestop 8:30 --days Mon,Tue,Wed,Thu,Fri,Sat,Sun -j ACCEPT禁止多個連接埠服務iptables -A Filter -m multiport -p tcp --dport 21,23,80 -j ACCEPT將WAN 口NAT到PCiptables -t nat -A PREROUTING -i $INTERNET_IF -d $INTERNET_ADDR -j DNAT --to-destination 192.168.0.1將WAN口8000連接埠NAT到192。168。100。200的80連接埠iptables -t nat -A PREROUTING -p tcp --dport 8000 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.200:80MAIL伺服器要轉的連接埠iptables -t nat -A PREROUTING -p tcp --dport 110 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.200:110iptables -t nat -A PREROUTING -p tcp --dport 25 -d $INTERNET_ADDR -j DNAT --to-destination 192.168.100.200:25隻允許PING 202。96。134。133,別的服務都禁止iptables -A Filter -p icmp -s 192.168.100.200 -d 202.96.134.133 -j ACCEPTiptables -A Filter -j DROP禁用BT配置iptables –A Filter –p tcp –dport 6000:20000 –j DROP禁用QQ防火牆配置iptables -A Filter -p udp --dport ! 53 -j DROPiptables -A Filter -d 218.17.209.0/24 -j DROPiptables -A Filter -d 218.18.95.0/24 -j DROPiptables -A Filter -d 219.133.40.177 -j DROP基於MAC,只能收發郵件,其它都拒絕iptables -I Filter -m mac --mac-source 00:0A:EB:97:79:A1 -j DROPiptables -I Filter -m mac --mac-source 00:0A:EB:97:79:A1 -p tcp --dport 25 -j ACCEPTiptables -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 DROPiptables -A Filter -p tcp --dport 1863 -j DROPiptables -A Filter -p tcp --dport 80 -d 207.68.178.238 -j DROPiptables -A Filter -p tcp --dport 80 -d 207.46.110.0/24 -j DROP只允許PING 202。96。134。133 其它公網IP都不許PINGiptables -A Filter -p icmp -s 192.168.100.200 -d 202.96.134.133 -j ACCEPTiptables -A Filter -p icmp -j DROP禁止某個MAC地址訪問internet:iptables -I Filter -m mac --mac-source 00:20:18:8F:72:F8 -j DROP禁止某個IP地址的PING:iptables –A Filter –p icmp –s 192.168.0.1 –j DROP禁止某個IP地址服務:iptables –A Filter -p tcp -s 192.168.0.1 --dport 80 -j DROPiptables –A Filter -p udp -s 192.168.0.1 --dport 53 -j DROP只允許某些服務,其他都拒絕(2條規則)iptables -A Filter -p tcp -s 192.168.0.1 --dport 1000 -j ACCEPTiptables -A Filter -j DROP禁止某個IP地址的某個連接埠服務iptables -A Filter -p tcp -s 10.10.10.253 --dport 80 -j ACCEPTiptables -A Filter -p tcp -s 10.10.10.253 --dport 80 -j DROP禁止某個MAC地址的某個連接埠服務iptables -I Filter -p tcp -m mac --mac-source 00:20:18:8F:72:F8 --dport 80 -j DROP禁止某個MAC地址訪問internet:iptables -I Filter -m mac --mac-source 00:11:22:33:44:55 -j DROP禁止某個IP地址的PING:iptables –A Filter –p icmp –s 192.168.0.1 –j DROP
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