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eth0ԭ�����������£�
IP: 211.71.6.144
MASK: 255.255.255.192
ROUTER: 211.71.6.190
DNS: 202.112.128.73
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Ϊ��ʹ��nat�����eth0����������һ��ip��192.168.3.1/255.255.255.0
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��/etc/dhcpd.conf�ļ��������������ã�
subnet 192.168.3.0 netmask 255.255.255.0 {
range 192.168.3.2 192.168.3.254;
option routers 192.168.3.1;
option domain-name "vrlab.buaa.edu.cn";
option domain-name-servers 202.112.128.73;
}
Ȼ������dhcp����
chkconfig dhcpd on
/etc/init.d/dhcpd start
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Ȼ���д�ű�/etc/init.d/nat���������£�
#!/bin/bash
IPTABLES='/usr/sbin/iptables'
EXTERNAL='eth0'
EXTERNIP='211.71.6.144'
INTERNAL='eth0'
INTERNIP='192.168.3.0/24'
# reset the three default ipchains
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
# reset the nat talbe
$IPTABLES -t nat -P PREROUTING ACCEPT
$IPTABLES -t nat -P POSTROUTING ACCEPT
$IPTABLES -t nat -P OUTPUT ACCEPT
# flush the ipchains and nat table
$IPTABLES -F
$IPTABLES -F -t nat
# delete non-default rules of ipchains and nat table
# only the flushed user-defined chains can be deleted
$IPTABLES -X
$IPTABLES -t nat -X
#reset zero
#$IPTABLES -Z -t nat
$IPTABLES -Z
$IPTABLES -t nat -Z
start(){
#load necessary modules
echo "Starting modprobe necessary modules for iptables"
modprobe ip_tables 1> /dev/null
modprobe ip_nat_ftp 2> /dev/null
modprobe ip_nat_irc 2> /dev/null
modprobe ip_conntrack 2> /dev/null
modprobe ip_conntrack_ftp 2> /dev/null
modprobe ip_conntrack_irc 2> /dev/null
# enable communication inside local domain
$IPTABLES -A INPUT -i $INTERNAL -s $INTERNIP -j ACCEPT
$IPTABLES -A OUTPUT -o $INTERNAL -d $INTERNIP -j ACCEPT
# enable ip masquerade
echo "1" >/proc/sys/net/ipv4/ip_forward
$IPTABLES -t nat -A POSTROUTING -o $EXTERNAL -s $INTERNIP -j MASQUERADE
}
stop(){
echo "Stopping firewall"
$IPTABLES -P INPUT DROP
$IPTABLES -P OUTPUT DROP
$IPTABLES -P FORWARD DROP
echo "0" >/proc/sys/net/ipv4/ip_forward
}
restart(){
stop
start
}
# see how we were called
case $1 in
start)
start
;;
stop)
stop
;;
restart)
restart
;;
*)
echo $"Usage:$0 { start | stop | restart }"
exit 1
esac
���ʹ��������������nat
chkconfig nat on
/etc/init.d/nat start
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