Servidor DHCP en ubuntu 12.04

[Melecio]

sigan los pasos solamente configuren las ip de la tarjeta eth0 segun el segmento del modem que les provee de internet una vez que vean que si funciona modifiquenlo a su gusto.

Asignarle direcciones ip fijas

Sudo gedit /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.1.25
netmask 255.255.255.0
gateway 192.168.1.1
network 192.168.1.0
broadcast 19.168.1.255
dns-nameservers 8.8.8.8 8.8.4.4
dns-search google.com

auto eth1
iface eth1 inet static
address 172.22.22.1
netmask 255.255.255.0
network 172.22.22.0
broadcast 172.22.22.255



sudo gedit /etc/sysctl.conf
Buscar esta linea
# net.ipv4.ip_forward=1
Quitarle el signo de gato y guardar
net.ipv4.ip_forward=1

sudo gedit /etc/rc.local
agregarle antes de exit 0
/sbin/iptables -P FORWARD ACCEPT
/sbin/iptables --table nat -A POSTROUTING -o eth0 -j MASQUERADE
















Asignación de servicio dhcp
Sudo gedit /etc/dhcp/dhcpd.conf
ddns-update-style none;
option domain-name "google.com";
option domain-name-servers 8.8.8.8, 8.8.4.4;
default-lease-time 3600;
max-lease-time 7200;
authoritative;
log-facility local7;
subnet 172.22.22.0 netmask 255.255.255.0 {
range 172.22.22.21 172.22.22.250;
option subnet-mask 255.255.255.0;
option broadcast-address 172.22.22.255;
option routers 172.22.22.1;
}

sudo gedit /etc/default/isc-dhcp-server
hay que agregarle eth1
INTERFACES=""
INTERFACES="eth1"
Parar y reiniciar dehcp server y despues reiniciar
sudo service isc-dhcp-server stop (if the service is already running; skip if it’s not running)
sudo service isc-dhcp-server start