NAT + DHCP

網卡及dhcp設定

cp /etc/sysconfig/network-scripts/ifcfg-eth0  /etc/sysconfig/network-scripts/ifcfg-eth0:0

vi  /etc/sysconfig/network-scripts/ifcfg-eth0:0

DEVICE=eth0:0

.....

IPADDR=192.168.1.1

....

#GATEWAY 不要設,多張網卡只設一個

vi /etc/sysconfig/dhcpd

DHCPDARGS=(不要設)

vi /etc/dhcpd.conf

....

subnet 192.168.1.0 netmask 255.255.255.0 {

option routers   192.168.1.1;

option broadcast-address 192.168.1.255;

....

}

NAT設定

vi /etc/rc.d/rc.local (加入下列指令, 開機會執行)

echo "1" > /proc/sys/net/ipv4/ip_forward   (啟動封包轉送功能)

iptables -F

iptables -Z

iptables -X

iptables -t nat -A POSTROUTING -o eth0 -s 192.168.1.0/24 -j MASQUERADE

(已可work, 但最好需要再安全一點的設定)