定制更友好的iptables防火墙

发布时间：2013-03-05 18:39:17作者：知识屋

作者：jeady

[root@localhost~]# vi /etc/iptables_settings.sh
#################################################################

#!/bin/sh -e

#----------------------------------------------------------

# iptables settings

#----------------------------------------------------------

#Connection IP address

SSH_IP1="192.168.1.0/24"

SSH_IP2="192.168.2.0/24"

SNMP_IP1="10.10.1.1"

SNMP_IP2="10.10.2.1"

#----------------------Standard part---------------------------

# Stop iptables service first

#service iptables stop

/sbin/iptables -F

/sbin/iptables -X

/sbin/iptables -Z

# Inital chains default policy

/sbin/iptables -F -t filter

/sbin/iptables -P INPUT DROP

/sbin/iptables -P OUTPUT ACCEPT

# Enable Native Network Transfer

/sbin/iptables -A INPUT -i lo -j ACCEPT

# Accept Established Connections

/sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# ICMP Control

/sbin/iptables -A INPUT -p icmp -m limit --limit 1/s --limit-burst 10 -j ACCEPT

# SSH Service

/sbin/iptables -A INPUT -s $SSH_IP1 -p tcp --dport 22 -j ACCEPT

/sbin/iptables -A INPUT -s $SSH_IP2 -p tcp --dport 22 -j ACCEPT

# SNMP Service

/sbin/iptables -A INPUT -s $SNMP_IP1 -p udp --dport 161 -j ACCEPT

/sbin/iptables -A INPUT -s $SNMP_IP2 -p udp --dport 161 -j ACCEPT

#-----------------------Custom part-----------------------

# Name Service

/sbin/iptables -A INPUT -p tcp --dport 53 -j ACCEPT

/sbin/iptables -A INPUT -p udp --dport 53 -j ACCEPT

此处增加自定义的内容

#deny all Service

/sbin/iptables -A INPUT -j REJECT --reject-with icmp-host-prohibited

/sbin/iptables -A FORWARD -j REJECT --reject-with icmp-host-prohibited

#################################################################

[root@localhost~]# chmod +x /etc/iptables_settings.sh

[root@localhost~]# echo "/etc/iptables_settings.sh">>/etc/rc.local

[root@localhost~]# chkconfig iptables off

[root@localhost~]# service iptables stop

[root@localhost~]# /etc/iptables_settings.sh

[root@localhost~]# iptables -L