Problème de partage de connexion internet

Bonjour chers amis internautes,
Bien je vous présente mon problème.
Voilà j'ai un pc muni de deux cartes réseaux sous lequel est configuré un serveur dhcp sous Ubuntu 7.10 mise à jour et donc tourne à présent avec Ubuntu 8.04.
l'adresse de la carte réseau éthernet etho est 192.168.16.6 qui me permet de me connecter sur internet
masi voilà la carte réseau ethernet eth1 sur la quelle je veux partager la connexion à des utilisateurs qui revecvront les paramétres au travers de mon serveur dhcp.

les config ip des mes cartes sont les suivantes:
etthernet eth0 ip :192.168.16.6
masque: 255.255.255.0
passerelle du serveur par qui je passe pour avoir ma connexion : 192.168.16.2
dns::192.168.16.2
ethernet eth1 ip : 192.168.1.0 "les machines clientes se connectent sur intrenet par dhcp au travers d'un switch reliée celle-ci "
Masque :255.255.255.0
passerelle : 192.168.16.6
Architectre du réseau est celle-ci:

machines clientes>>>switch>>>eth1>>>eth0>>>internet

"J'ai un problème c'est que je ne sais pas quelle passerlle mettre au niveau du fichier de config dhcpd.conf pour que les clients aient accès à intrenet via ma machine."
je vous file là aussi la config de mon fichier dhcpd.conf que vous m'aidiez comme vous pouvez.
Toutes les suggestions sont la bienvenue.

Ci-après le contenu de mon fichier dhcpd.conf:
ddns-update-style interim;

ddns-updates on;

allow client-updates;

one-lease-per-client true;

allow bootp;

option T150 code 150 = string;

#

# Sample configuration file for ISC dhcpd for Debian

#

# $Id: dhcpd.conf,v 1.1.1.1 2002/05/21 00:07:44 peloy Exp $

#



# attempt to do a DNS update when a lease is confirmed. We default to the

# behavior of the version 2 packages ('none', since DHCP v2 didn't

# have support for DDNS.)



# option definitions common to all supported networks...

option domain-name "groupsia.local";

option domain-name-servers 192.168.16.2,195.24.192.33;

#option domain-name-servers 195.24.192.33,195.24.194.177;



default-lease-time 7200;

max-lease-time 84600;



# If this DHCP server is the official DHCP server for the local

# network, the authoritative directive should be uncommented.

authoritative;



# Use this to send dhcp log messages to a different log file (you also

# have to hack syslog.conf to complete the redirection).

log-facility local7;



# No service will be given on this subnet, but declaring it helps the

# DHCP server to understand the network topology.



#subnet 10.152.187.0 netmask 255.255.255.0 {

#}



# This is a very basic subnet declaration.





# This declaration allows BOOTP clients to get dynamic addresses,

# which we don't really recommend.





# A slightly different configuration for an internal subnet.



# Hosts which require special configuration options can be listed in

# host statements. If no address is specified, the address will be

# allocated dynamically (if possible), but the host-specific information

# will still come from the host declaration.



#host passacaglia {

# hardware ethernet 0:0:c0:5d:bd:95;

# filename "vmunix.passacaglia";

# server-name "toccata.fugue.com";

#}



# Fixed IP addresses can also be specified for hosts. These addresses

# should not also be listed as being available for dynamic assignment.

# Hosts for which fixed IP addresses have been specified can boot using

# BOOTP or DHCP. Hosts for which no fixed address is specified can only

# be booted with DHCP, unless there is an address range on the subnet

# to which a BOOTP client is connected which has the dynamic-bootp flag

# set.

#host fantasia {

# hardware ethernet 08:00:07:26:c0:a5;

# fixed-address fantasia.fugue.com;

#}



# You can declare a class of clients and then do address allocation

# based on that. The example below shows a case where all clients

# in a certain class get addresses on the 10.17.224/24 subnet, and all

# other clients get addresses on the 10.0.29/24 subnet.



#class "foo" {

# match if substring (option vendor-class-identifier, 0, 4) = "SUNW";

#}



#shared-network 224-29 {

# subnet 10.17.224.0 netmask 255.255.255.0 {

# option routers rtr-224.example.org;

# }

# subnet 10.0.29.0 netmask 255.255.255.0 {

# option routers rtr-29.example.org;

# }

# pool {

# allow members of "foo";

# range 10.17.224.10 10.17.224.250;

# }

# pool {

# deny members of "foo";

# range 10.0.29.10 10.0.29.230;

# }

#}

#

subnet 192.168.1.0 netmask 255.255.255.0 {

interface eth1;

range 192.168.1.10 192.168.1.150;

default-lease-time 3600;

max-lease-time 7200;

option domain-name "groupsia.local";

option subnet-mask 255.255.255.0;

option broadcast-address 192.168.1.255;

option routers 192.168.16.6;

option domain-name-servers 192.168.16.2,195.24.192.33;

}#

et aussi le contenu du /etc/network/interfaces :
etc.network.interfaces

auto lo
iface lo inet loopback


iface eth0 inet static
address 192.168.16.6
netmask 255.255.255.0
gateway 192.168.16.2

auto eth0

iface eth1 inet static
address 192.168.1.0
netmask 255.255.255.0
broadcast 192.168.1.255
network 192.168.1.0



auto eth1
Toutes le suggestions seront la bienvenue.
Merci et bonne journée.