Step # 1: Enabling IPFW
Open /etc/rc.conf file# vi /etc/rc.conf
Append following settings:firewall_enable="YES"
firewall_script="/usr/local/etc/ipfw.rules"
Save and close the file..
Step # 2 Write a Firewall Rule Script
You need to place a firewall rules in a script called /usr/local/etc/ipfw.rule:# vi /usr/local/etc/ipfw.rules
Append following code:
IPF="ipfw -q add"
ipfw -q -f flush
#loopback
$IPF 10 allow all from any to any via lo0
$IPF 20 deny all from any to 127.0.0.0/8
$IPF 30 deny all from 127.0.0.0/8 to any
$IPF 40 deny tcp from any to any frag
# statefull
$IPF 50 check-state
$IPF 60 allow tcp from any to any established
$IPF 70 allow all from any to any out keep-state
$IPF 80 allow icmp from any to any
# open port ftp (20,21), ssh (22), mail (25)
# http (80), dns (53) etc
$IPF 110 allow tcp from any to any 21 in
$IPF 120 allow tcp from any to any 21 out
$IPF 130 allow tcp from any to any 22 in
$IPF 140 allow tcp from any to any 22 out
$IPF 150 allow tcp from any to any 25 in
$IPF 160 allow tcp from any to any 25 out
$IPF 170 allow udp from any to any 53 in
$IPF 175 allow tcp from any to any 53 in
$IPF 180 allow udp from any to any 53 out
$IPF 185 allow tcp from any to any 53 out
$IPF 200 allow tcp from any to any 80 in
$IPF 210 allow tcp from any to any 80 out
# deny and log everything
$IPF 500 deny log all from any to any
Save and close the file.
Step # 3: Start a firewall
You can reboot the box or you could reload these rules by entering on the command line.# sh /usr/local/etc/ipfw.rules
Task: List all the rules in sequence
Type the following command:# ipfw list
IPF="ipfw -q add"
ipfw -q -f flush #loopback
$IPF allow from any to any via lo0
$IPF deny all from any to 127.0.0.0/
$IPF deny all from 127.0.0.0/ to any
$IPF deny tcp from any to any frag #statefull
$IPF check-state
$IPF allow tcp from any to any established
$IPF allow all from any to any out keep-state
$IPF allow icmp from any to any #open port ftp(,),ssh(),mail(),http(),dns()
$IPF allow tcp from any to any in
$IPF allow tcp from any to any out
$IPF allow tcp from any to any in
$IPF allow tcp from any to any out
$IPF allow tcp from any to any in
$IPF allow tcp from any to any out
$IPF allow udp from any to any in
$IPF allow tcp from any to any in
$IPF allow udp from any to any out
$IPF allow tcp from any to any out $IPF allow tcp from any to any in
$IPF allow tcp from any to any out #deny and log everything
$IPF deny log all from any to any
修改/etc/rc.conf
Append following settings
firewall_enable="YES"
firewall_script="/usr/local/etc/ipfw.rules"
/etc/rc.d/ipfw restart
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alt="" />
相对针对debian及Centos 系统 的初始化一个系统的 时候设置的iptables shell (仅放行 22 (或是被修改为别的端口)and 80) 以建立的连接ping 等
#!/bin/bash iptables -F
iptables -X
/etc/rc.d/init.d/iptables save
service iptables restart iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DROP #iptables -A INPUT -p tcp --dport -j ACCEPT
#iptables -A INPUT -p tcp --dport -j ACCEPT
iptables -A INPUT -p tcp --dport -j ACCEPT
iptables -A INPUT -p tcp --dport -j ACCEPT
iptables -A INPUT -p icmp -j ACCEPT
#from out hosts ping
#iptables -A OUTPUT -p icmp -j ACCEPT
#iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT # ping Internet
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT #Dns
#iptables -A OUTPUT -p tcp --sport -j ACCEPT
#iptables -A OUTPUT -p tcp --dport -j ACCEPT
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alt="" />
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