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操作基于ubuntu server10.10 上进行安装配置.进行配置iptables.ip转换.mac过虑功能.

1.建iptables

root@ptubuntufirewall:/# vi /etc/init.d/iptables

#fLUSH THE FILTER,NAT,Mangle chain!
/sbin/iptables -F -t filter
/sbin/iptables -F -t nat
/sbin/iptables -F -t mangle

#Flush the user's chain
/sbin/iptables -t filter -X
/sbin/iptables -t nat -X
/sbin/iptables -t mangle -X
#Set default policies to DROP
/sbin/iptables -P INPUT ACCEPT
/sbin/iptables -P OUTPUT ACCEPT
/sbin/iptables -P FORWARD ACCEPT
#LAN NAT
/sbin/iptables -A POSTROUTING -t nat -s 192.168.0.0/255.255.255.0 -o eth1 -j MASQUERADE
#/sbin/iptables -A POSTROUTING -t nat -s 192.168.0.0/255.255.255.0 -o eth0 -j MASQUERADE
if [ -f /etc/access_mac.conf ]
then
for i in `cat /etc/access_mac.conf | grep "^[^#]" | tr -s "[12]" | cut -c1-17` ; do
/sbin/iptables -A FORWARD -m mac --mac-source $i -i eth0 -j ACCEPT
done
fi
/sbin/iptables -A FORWARD -i eth0 -j DROP

root@ptubuntufirewall:/#vi /etc/access_mac.conf

root@ptubuntufirewall:/# update-rc.d iptables defaults 99

显示如下表示成功.

update-rc.d: warning: /etc/init.d/iptables missing LSB information

update-rc.d: see <http://wiki.debian.org/LSBInitScripts>

Adding system startup for /etc/init.d/iptables …

/etc/rc0.d/K99iptables -> ../init.d/iptables

/etc/rc1.d/K99iptables -> ../init.d/iptables

/etc/rc6.d/K99iptables -> ../init.d/iptables

/etc/rc2.d/S99iptables -> ../init.d/iptables

/etc/rc3.d/S99iptables -> ../init.d/iptables

/etc/rc4.d/S99iptables -> ../init.d/iptables

/etc/rc5.d/S99iptables -> ../init.d/iptables

root@ptubuntufirewall:/#aptitude install dhcp3-server

root@ptubuntufirewall:/#vi /etc/dhcp3/dhcpd.conf

文档内容:

option domain-name “ptubuntufirewall.com”;

option domain-name-servers 8.8.4.4, 8.8.8.8;

default-lease-time 18000;

max-lease-time 36000;

subnet 192.168.0.0 netmask 255.255.255.0 {

range dynamic-bootp 192.168.0.100 192.168.0.255;

option subnet-mask 255.255.255.0;

option broadcast-address 192.168.0.255;

option routers 192.168.0.252;

option time-offset -18000;

}

root@ptubuntufirewall:/# ping 192.168.0.252

root@ptubuntufirewall:/#ping 8.8.8.8外网IP都可以正常.

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