#/sbin/modprobe iptable_filter
#/sbin/modprobe ip_tables
#/sbin/modprobe iptable_nat
#/sbin/iptables -F -t nat
adsl拨号的转发
/sbin/iptables -t nat -A POSTROUTING -s 172.16.0.0/24 -o ppp0 -j MASQUERADE
网卡转发
/sbin/iptables -t nat -A POSTROUTING -s 172.16.0.0/24 -o eth0 -j MASQUERADE
封堵 tcp udp 端口, 并打开特定的端口(包括vpn转发,进入的端口)
/sbin/iptables -I INPUT -p tcp -s 172.16.0.0/24 -m multiport --dports 110,80,25,22,443,5432,3306,21,445,10101,5252,8080,8383,139,1723 -j ACCEPT
/sbin/iptables -A INPUT -p tcp -s 172.16.0.0/24 --dport 5432 -j ACCEPT
/sbin/iptables -A INPUT -p udp -s 172.16.0.0/24 -m multiport --dports 53,111 -j ACCEPT
/sbin/iptables -A INPUT -p gre -s 172.16.0.0/24 -j ACCEPT
#/sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A INPUT -s 172.16.0.0/24 -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A FORWARD -p tcp -s 172.16.0.0/24 -m multiport --dports 80,110,21,25,1723,22,5252,10101,3306,443,5432,8080,2000,1935,8383 -j ACCEPT
/sbin/iptables -A FORWARD -p udp -s 172.16.0.0/24 --dport 53 -j ACCEPT
/sbin/iptables -A FORWARD -p udp -s 172.16.0.0/24 --dport 8000 -j ACCEPT
某游戏端口
#/sbin/iptables -A FORWARD -p udp -s 172.16.0.0/24 --dport 7000 -j ACCEPT
vpn 所需协议
/sbin/iptables -A FORWARD -p gre -s 172.16.0.0/24 -j ACCEPT
运行ping
/sbin/iptables -A FORWARD -p icmp -s 172.16.0.0/24 -j ACCEPT
#加这一句, ICMP应答、FTP传输、DCC等才能穿过防火墙正常工作。大部分还有一些UDP协议都依赖这个机制。不打开, bt们就不能变态了,bt软件不能穿透防火墙了, 需要进行ftp时候再打开, 限制只让 tcp 的包穿透防火墙
#/sbin/iptables -A FORWARD -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A FORWARD -s 172.16.0.0/24 -p tcp -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
#封住 tcp, udp 所有端口 (应该有其他方法)
/sbin/iptables -A FORWARD -p tcp -s 172.16.0.0/24 --dport 0:65535 -j DROP
/sbin/iptables -A FORWARD -p udp -s 172.16.0.0/24 --dport 0:65535 -j DROP
/sbin/iptables -A INPUT -p tcp -s 172.16.0.0/24 --dport 0:65535 -j DROP
/sbin/iptables -A INPUT -p udp -s 172.16.0.0/24 --dport 0:65535 -j DROP
#我的ip, 不受规则限制
/sbin/iptables -I INPUT -s 172.16.0.108 -j ACCEPT
/sbin/iptables -I FORWARD -s 172.16.0.108 -j ACCEPT
# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- 172.16.0.108 anywhere
ACCEPT tcp -- 172.16.0.0/24 anywhere multiport dports pop3,http,smtp,ssh,https,postgres,mysql,ftp,microsoft-ds,10101,5252,webcache,8383,netbios-ssn,1723
ACCEPT tcp -- 172.16.0.0/24 anywhere state RELATED,ESTABLISHED
ACCEPT tcp -- 172.16.0.0/24 anywhere tcp dpt:postgres
ACCEPT udp -- 172.16.0.0/24 anywhere multiport dports domain,sunrpc
ACCEPT gre -- 172.16.0.0/24 anywhere
DROP tcp -- 172.16.0.0/24 anywhere tcp
DROP udp -- 172.16.0.0/24 anywhere udp
Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere state NEW,RELATED,ESTABLISHED
ACCEPT all -- 172.16.0.108 anywhere
ACCEPT tcp -- 172.16.0.0/24 anywhere multiport dports http,pop3,ftp,smtp,1723,ssh,5252,10101,mysql,https,postgres,webcache,sieve,1935,8383
ACCEPT udp -- 172.16.0.0/24 anywhere udp dpt:domain
ACCEPT udp -- 172.16.0.0/24 anywhere udp dpt:8000
ACCEPT udp -- 172.16.0.0/24 anywhere udp dpt:afs3-fileserver
ACCEPT gre -- 172.16.0.0/24 anywhere
ACCEPT icmp -- 172.16.0.0/24 anywhere
DROP tcp -- 172.16.0.0/24 anywhere tcp
DROP udp -- 172.16.0.0/24 anywhere udp
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
=======================================================
封ip
/sbin/iptables -A FORWARD -s 172.16.0.*** -j DROP
取消ip封闭
/sbin/iptables -D FORWARD -s 172.16.0.*** -j DROP
=======================================================
路由端口转发, 电驴为高id用户, 但是试过后,好像不行
/sbin/iptables -t nat -A PREROUTING -p udp -m udp --dport 19145 -j DNAT --to-destination 172.16.0.108:19145
/sbin/iptables -t nat -A POSTROUTING -s 172.16.0.0/16 -d 172.16.0.108 -p udp -m udp --dport 19145 -j SNAT --to-source 172.16.0.2
/sbin/iptables -t nat -A PREROUTING -p tcp -m tcp --dport 19145 -j DNAT --to-destination 172.16.0.108:19145
/sbin/iptables -t nat -A POSTROUTING -s 172.16.0.0/16 -d 172.16.0.108 -p tcp -m tcp --dport 19145 -j SNAT --to-source 172.16.0.2
#/sbin/iptables -t nat -A PREROUTING -p udp -m udp --dport 4662 -j DNAT --to-destination 172.16.0.108:4662
#/sbin/iptables -t nat -A POSTROUTING -s 172.16.0.0/16 -d 172.16.0.108 -p udp -m udp --dport 4662 -j SNAT --to-source 172.16.0.2
#/sbin/iptables -t nat -A PREROUTING -p tcp -m tcp --dport 4662 -j DNAT --to-destination 172.16.0.108:4662
#/sbin/iptables -t nat -A POSTROUTING -s 172.16.0.0/16 -d 172.16.0.108 -p tcp -m tcp --dport 4662 -j SNAT --to-source 172.16.0.2
=============================================================
###### 用mac地址封闭上网
######注意顺序问题
#/sbin/iptables -A FORWARD -m mac --mac-source 00:00:BA:A5:7D:12 -p tcp -m multiport --dports 80,110,21,25,1723,22,5252,10101,3306,443,5432,8080,2000,1935,8383 -j ACCEPT
#/sbin/iptables -A FORWARD -m mac --mac-source 00:00:BA:A5:7D:12 -p udp --dport 53 -j ACCEPT
#/sbin/iptables -A FORWARD -p icmp -j ACCEPT
######这一行保持在最后. 用iptables -L 查看
#/sbin/iptables -A FORWARD -m mac --mac-source 00:00:BA:A5:7D:12 -j DROP
