dhcp en ubuntu

master

eth0

eth1

slave

eth0

Master:

tarjeta de internet: eth0

tarjeta interna : eth1

vamos al fichero /etc/network/interfaces

debajo de donde pone eth0 pongo

auto eth1

iface eth1 inet static

adress 192.168.2.1 (el server sirve como router)

netmask 255.255.255.0 (red clase C creo..)

pre-up /etc/network/if-pre-up.d/masquarading_from_eth1_to_eth_0.sh

me copio el fichero masquarading_from_eth1_to_eth_0.sh al directorio anterior.

$ifconfig me dirá que tarjetas de red tengo activadas.

$ifconfig -a -> veo que eth1 está sin activar (si no me sale..)

Me lo instalo:

$su apt-get install dhcp3-server

/etc/init.d/dhcp3-server start Para iniciar el servidor

editar el fichero /etc/dhcp.conf

option domain-name "nombredelserver.org";

option domain-name-servers 142.206.5.234, 153.206.5.45; <- las direcciones de los DNS

subnet 192.168.2.0 netmask 255.255.255.0 {

range 192.168.2.2 192.168.2.65; <- Rango de direcciones al que voy a servir

option routers 192.168.2.1;

}

host krusty { <- krusty es el ordenador al que quiero servir

option host-name "krusty.maquina.es";

hardware ethernet 00:12:53:a0:2c:b6; <- la dirección MAC del ordenador slave

fixed-address 192.168.2.50;

server-name "nombredelServer.nombreDeLaMaquina.es"; <- nombre del servidor

next-server 192.168.2.1;

#ifup eth1

Esto debería devolver un OK. Se puede comprobar si se ha tenido éxito haciendo un ifconfig otra vez y ver si nos aparece la eth1.

OJITO: es fundamental poner la dirección mac del ordenador al que queremos servir. si no la conocemos tenemos que encender el slave y buscarla.

fichero masquarading_from_eth1_to_eth_0.sh:

#!/bin/sh

##

## masquarading_from_eth1_to_eth0.sh

##

## Made by root

##

##

UNIVERSE=eth0

DMZ=eth1

#

# delete all existing rules.

#

iptables -F

iptables -t nat -F

iptables -t mangle -F

iptables -X

# Always accept loopback traffic

iptables -A INPUT -i lo -j ACCEPT

# Allow established connections, and those not coming from the outside

iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A INPUT -m state --state NEW -i ! $UNIVERSE -j ACCEPT

iptables -A FORWARD -i $UNIVERSE -o $DMZ -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allow outgoing connections from the LAN side.

iptables -A FORWARD -i $DMZ -o $UNIVERSE -j ACCEPT

# Masquerade.

iptables -t nat -A POSTROUTING -o $UNIVERSE -j MASQUERADE

# Enable routing.

echo 1 > /proc/sys/net/ipv4/ip_forward

# We map some ports

iptables -A PREROUTING -t nat -i $UNIVERSE -p tcp --dport 10080 -j DNAT --to 192.168.2.50:80

iptables -A PREROUTING -t nat -i $UNIVERSE -p tcp --dport 10022 -j DNAT --to 192.168.2.50:22

de donde se deduce que la @IP de mi slave es 192.168.2.50

En el slave no hay que hacer apenas nada. Simplemente poner la @IP que le corresponde y la máscara de red.

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