URL: https://linuxfr.org/forums/linux-debian-ubuntu/posts/debian-31-configuration-dun-serveur-dhcpnat
Title: debian 3.1: configuration d'un serveur dhcp/nat
Authors: Tonguim Ferdinand GUINKO
Date: 2007年05月01日T13:07:47+02:00
Tags: debian
Score: 0
Bonjour, 
 
**Contexte:** je dispose de 2 adresses routables ip_routable1 et ip_routable2, et d'un réseau local compose de plusieurs ordinateurs. 
 
**Objectif:** partage de la connexion internet sur le reseau local, adressage dynamique 
 
**Methode:** sur un système debian 3.1, j'ai installé un serveur dhcp (dhcp3-server), que j'ai configuré ainsi qu'il suit (voir ci-dessous). 
 
**Problème:** 
Les postes clients recoivent des adresses dynamiques (192.168.0.XXX) du serveur dhcp et "ping" l'interface locale (192.168.0.1) du serveur dhcp/nat. 
par contre, les postes clients ne "ping" ni l'interface internet du serveur dhcp/nat, ni l'interface de la passerelle (routeur), et par conséquent n'accèdent pas à internet! 
 
Comment résoudre cela? Merci. 
 
 
 # The ddns-updates-style parameter controls whether or not the server will 
 # 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.) 
 ddns-update-style none; 
 
 # 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; 
 
 # A slightly different configuration for an internal subnet. 
 £spaces£ £/spaces£subnet 192.168.0.0 netmask 255.255.255.0 { 
 £spaces£ £/spaces£range 192.168.0.3 192.168.0.253; 
 £spaces£ £/spaces£option domain-name-servers dns_1, dns_2; 
 
 # option domain-name "internal.example.org"; 
 £spaces£ £/spaces£option routers ip_routable1; 
 £spaces£ £/spaces£option broadcast-address 192.168.0.255; 
 £spaces£ £/spaces£default-lease-time 600; 
 £spaces£ £/spaces£max-lease-time 7200; 
 } 
 
 
Ensuite j'ai fait le partage de la connexion internet ainsi qu'il suit: 
 
 
 debian1:~# iptables -t nat -F 
 debian1:~# iptables -t nat -A POSTROUTING -o eth1 -s 192.168.0.0 -j MASQUERADE 
 debian1:~# echo 1 > /proc/sys/net/ipv4/ip_forward 
 
 
**NB: eth1 est l'interface réseau internet et 192.168.0.0 l'adresse de mon reseau local** 
 
Ci-dessous la configuration des 2 interfaces de mon serveur dhcp/nat: 
 
 
 # This file describes the network interfaces available on your system 
 # and how to activate them. For more information, see interfaces(5). 
 
 # The loopback network interface 
 auto lo 
 iface lo inet loopback 
 
 # The primary network interface 
 #auto eth0 
 #iface eth0 inet dhcp 
 
 auto eth0 
 iface eth0 inet static 
 address 192.168.0.1 
 netmask 255.255.255.0 
 network 192.168.0.0 
 broadcast 192.168.0.255 
 gateway 192.168.0.1 
 
 auto eth1 
 iface eth1 inet static 
 address ip_routable2 
 netmask 255.255.255.252 
 network xxx.xxx.xxx.16 
 broadcast xxx.xxx.xxx.19 
 gateway ip_routable1 
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