Konfigurasi DHCP
 1.apt-get install dhcp3-server
  2. gedit /etc/network/interfaces
iface eth1 inet static
address 192.168.20.1
netmask 255.255.255.0
network 192.168.20.0
broadcast 192.168.20.255
auto eth1
iface eth0 inet dhcp
auto eth0
3.    gedit /etc/default/dhcp3-server
4.    gedit /etc/dhcp3/dhcpd.conf 
#authoritive (dihapus pagarnya)
# a slighty different configuration  for on internet subnet
    subnet 192.168.20.0 netmask 255.255.255.0
    range 192.168.20.51 192.168.20.254
    ------------------------------------------
    ------------------------------------------
    option routers 192.168.20.1
    option broadcast-address 192.168.20.255
5.    /etc/init.d/dhcp3-server restart
6.    gedit /etc/rc.local
iptables -A POSTROUTING -t nat -o eth0 -j MASQUERADE
7.    iptables -t nst -n -L
8.    gedit /etc/sysctl.conf
ipv4.forward = 1 (pagarnya dibuang)
9.    sysctl -p
10.    /etc/init.d/networking restart