Linux iptables 一个较为详细的示例

#!/bin/bash

#

# The interface that connect Internet

 

# echo

echo "Enable IP Forwarding…"

echo 1 > /proc/sys/net/ipv4/ip_forward

echo "Starting iptables rules…"

 

IFACE="eth0"

 

# include module

modprobe ip_tables

modprobe iptable_nat

modprobe ip_nat_ftp

modprobe ip_nat_irc

modprobe ip_conntrack

modprobe ip_conntrack_ftp

modprobe ip_conntrack_irc

modprobe ipt_MASQUERADE

 

 

# init

/sbin/iptables -F

/sbin/iptables -X

/sbin/iptables -Z

/sbin/iptables -F -t nat

/sbin/iptables -X -t nat

/sbin/iptables -Z -t nat

 

/sbin/iptables -X -t mangle

 

# drop all

/sbin/iptables -P INPUT DROP

/sbin/iptables -P FORWARD ACCEPT

/sbin/iptables -P OUTPUT ACCEPT

/sbin/iptables -t nat -P PREROUTING ACCEPT

/sbin/iptables -t nat -P POSTROUTING ACCEPT

/sbin/iptables -t nat -P OUTPUT ACCEPT

 

 

/sbin/iptables -A INPUT -f -m limit –limit 100/sec –limit-burst 100 -j ACCEPT

/sbin/iptables -A INPUT -p tcp -m tcp –tcp-flags SYN,RST,ACK SYN -m limit –limit 20/sec –limit-burst 200 -j ACCEPT

 

/sbin/iptables -A INPUT -p icmp -m limit –limit 12/min –limit-burst 2 -j DROP

 

/sbin/iptables -A FORWARD -f -m limit –limit 100/sec –limit-burst 100 -j ACCEPT

/sbin/iptables -A FORWARD -p tcp -m tcp –tcp-flags SYN,RST,ACK SYN -m limit –limit 20/sec –limit-burst 200 -j ACCEPT

 

 

 

 

# open ports

/sbin/iptables -A INPUT -i $IFACE -p tcp –dport 21 -j ACCEPT

/sbin/iptables -A INPUT -i $IFACE -p tcp –dport 22 -j ACCEPT

/sbin/iptables -A INPUT -i $IFACE -p tcp –dport 25 -j ACCEPT

/sbin/iptables -A INPUT -i $IFACE -p tcp –dport 53 -j ACCEPT

/sbin/iptables -A INPUT -i $IFACE -p udp –dport 53 -j ACCEPT

/sbin/iptables -A INPUT -i $IFACE -p tcp –dport 80 -j ACCEPT

/sbin/iptables -A INPUT -i $IFACE -p tcp –dport 100 -j ACCEPT

/sbin/iptables -A INPUT -i $IFACE -p tcp –dport 113 -j ACCEPT

 

 

# close ports

iptables -I INPUT -p udp –dport 69 -j DROP

iptables -I INPUT -p tcp –dport 135 -j DROP

iptables -I INPUT -p udp –dport 135 -j DROP

iptables -I INPUT -p tcp –dport 136 -j DROP

iptables -I INPUT -p udp –dport 136 -j DROP

iptables -I INPUT -p tcp –dport 137 -j DROP

iptables -I INPUT -p udp –dport 137 -j DROP

iptables -I INPUT -p tcp –dport 138 -j DROP

iptables -I INPUT -p udp –dport 138 -j DROP

iptables -I INPUT -p tcp –dport 139 -j DROP

iptables -I INPUT -p udp –dport 139 -j DROP

iptables -I INPUT -p tcp –dport 445 -j DROP

iptables -I INPUT -p udp –dport 445 -j DROP

iptables -I INPUT -p tcp –dport 593 -j DROP

iptables -I INPUT -p udp –dport 593 -j DROP

iptables -I INPUT -p tcp –dport 1068 -j DROP

iptables -I INPUT -p udp –dport 1068 -j DROP

iptables -I INPUT -p tcp –dport 4444 -j DROP

iptables -I INPUT -p udp –dport 4444 -j DROP

iptables -I INPUT -p tcp –dport 5554 -j DROP

iptables -I INPUT -p tcp –dport 1434 -j DROP

iptables -I INPUT -p udp –dport 1434 -j DROP

iptables -I INPUT -p tcp –dport 2500 -j DROP

iptables -I INPUT -p tcp –dport 5800 -j DROP

iptables -I INPUT -p tcp –dport 5900 -j DROP

iptables -I INPUT -p tcp –dport 6346 -j DROP

iptables -I INPUT -p tcp –dport 6667 -j DROP

iptables -I INPUT -p tcp –dport 9393 -j DROP

 

iptables -I FORWARD -p udp –dport 69 -j DROP

iptables -I FORWARD -p tcp –dport 135 -j DROP

iptables -I FORWARD -p udp –dport 135 -j DROP

iptables -I FORWARD -p tcp –dport 136 -j DROP

iptables -I FORWARD -p udp –dport 136 -j DROP

iptables -I FORWARD -p tcp –dport 137 -j DROP

iptables -I FORWARD -p udp –dport 137 -j DROP

iptables -I FORWARD -p tcp –dport 138 -j DROP

iptables -I FORWARD -p udp –dport 138 -j DROP

iptables -I FORWARD -p tcp –dport 139 -j DROP

iptables -I FORWARD -p udp –dport 139 -j DROP

iptables -I FORWARD -p tcp –dport 445 -j DROP

iptables -I FORWARD -p udp –dport 445 -j DROP

iptables -I FORWARD -p tcp –dport 593 -j DROP

iptables -I FORWARD -p udp –dport 593 -j DROP

iptables -I FORWARD -p tcp –dport 1068 -j DROP

iptables -I FORWARD -p udp –dport 1068 -j DROP

iptables -I FORWARD -p tcp –dport 4444 -j DROP

iptables -I FORWARD -p udp –dport 4444 -j DROP

iptables -I FORWARD -p tcp –dport 5554 -j DROP

iptables -I FORWARD -p tcp –dport 1434 -j DROP

iptables -I FORWARD -p udp –dport 1434 -j DROP

iptables -I FORWARD -p tcp –dport 2500 -j DROP

iptables -I FORWARD -p tcp –dport 5800 -j DROP

iptables -I FORWARD -p tcp –dport 5900 -j DROP

iptables -I FORWARD -p tcp –dport 6346 -j DROP

iptables -I FORWARD -p tcp –dport 6667 -j DROP

iptables -I FORWARD -p tcp –dport 9393 -j DROP

 

/sbin/iptables -A INPUT -i $IFACE -m state –state RELATED,ESTABLISHED -j ACCEPT

/sbin/iptables -A INPUT -i $IFACE -m state –state NEW,INVALID -j DROP

 

 

# drop ping

/sbin/iptables -A INPUT -p icmp -j DROP

 

/sbin/iptables -I INPUT -s 222.182.40.241 -j DROP