{"id":388,"date":"2026-05-22T15:12:14","date_gmt":"2026-05-22T13:12:14","guid":{"rendered":"https:\/\/eryann.fr\/?p=388"},"modified":"2026-05-22T15:13:13","modified_gmt":"2026-05-22T13:13:13","slug":"fiche-vlan-sur-ubuntu-avec-netplan","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/8021q\/fiche-vlan-sur-ubuntu-avec-netplan\/","title":{"rendered":"Fiche vlan sur ubuntu avec netplan"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">1. Introduction<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Dans un environnement professionnel, tu vas souvent devoir segmenter le r\u00e9seau pour s\u00e9parer les usages, am\u00e9liorer la s\u00e9curit\u00e9 ou organiser les services. Les VLAN (Virtual LAN) permettent justement de cr\u00e9er plusieurs r\u00e9seaux logiques sur une m\u00eame infrastructure physique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sous Ubuntu Server, la configuration r\u00e9seau moderne repose principalement sur <strong>Netplan<\/strong>. Cet outil simplifie la gestion des interfaces r\u00e9seau et permet de configurer facilement des VLAN, des routes, des adresses IP statiques ou du DHCP.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans cette fiche, tu vas apprendre :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ce qu\u2019est un VLAN ;<\/li>\n\n\n\n<li>comment fonctionne Netplan ;<\/li>\n\n\n\n<li>comment cr\u00e9er un VLAN sous Ubuntu ;<\/li>\n\n\n\n<li>comment v\u00e9rifier et d\u00e9panner la configuration ;<\/li>\n\n\n\n<li>comment s\u00e9curiser et journaliser le fonctionnement r\u00e9seau.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019objectif p\u00e9dagogique correspond directement aux comp\u00e9tences attendues en BTS CIEL et BTS SIO lors de la mise en place d\u2019infrastructures r\u00e9seau segment\u00e9es.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">2. Sommaire<\/h1>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Introduction<\/li>\n\n\n\n<li>Sommaire<\/li>\n\n\n\n<li>Comprendre le fonctionnement des VLAN<\/li>\n\n\n\n<li>Comprendre Netplan sous Ubuntu<\/li>\n\n\n\n<li>Installer les outils n\u00e9cessaires<\/li>\n\n\n\n<li>Identifier les interfaces r\u00e9seau<\/li>\n\n\n\n<li>Configurer un VLAN avec Netplan<\/li>\n\n\n\n<li>Exemple complet de configuration<\/li>\n\n\n\n<li>Fichiers importants<\/li>\n\n\n\n<li>V\u00e9rifier le fonctionnement<\/li>\n\n\n\n<li>Cas concrets d\u2019utilisation<\/li>\n\n\n\n<li>Pare-feu et s\u00e9curit\u00e9<\/li>\n\n\n\n<li>Commandes utiles et d\u00e9pannage<\/li>\n\n\n\n<li>Logs r\u00e9seau et analyse<\/li>\n\n\n\n<li>Erreurs fr\u00e9quentes<\/li>\n\n\n\n<li>Bonnes pratiques<\/li>\n\n\n\n<li>Pour aller plus loin<\/li>\n\n\n\n<li>Liens utiles<\/li>\n\n\n\n<li>Id\u00e9es de TP<\/li>\n<\/ol>\n\n\n\n<h1 class=\"wp-block-heading\">3. Comprendre le fonctionnement des VLAN<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Un VLAN permet de s\u00e9parer logiquement des \u00e9quipements r\u00e9seau m\u00eame s\u2019ils utilisent le m\u00eame switch physique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VLAN 10 \u2192 administration<\/li>\n\n\n\n<li>VLAN 20 \u2192 serveurs<\/li>\n\n\n\n<li>VLAN 30 \u2192 utilisateurs<\/li>\n\n\n\n<li>VLAN 40 \u2192 Wi-Fi invit\u00e9<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Chaque VLAN agit comme un r\u00e9seau ind\u00e9pendant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le switch ajoute un identifiant VLAN dans les trames Ethernet gr\u00e2ce au protocole IEEE 802.1Q.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>VLAN<\/th><th>R\u00e9seau<\/th><\/tr><\/thead><tbody><tr><td>10<\/td><td>192.168.10.0\/24<\/td><\/tr><tr><td>20<\/td><td>192.168.20.0\/24<\/td><\/tr><tr><td>30<\/td><td>192.168.30.0\/24<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Dans Linux, un VLAN appara\u00eet comme une interface virtuelle :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ens18.10<br>ens18.20<br>ens18.30<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ici :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>ens18<\/code> = interface physique ;<\/li>\n\n\n\n<li><code>.10<\/code> = VLAN ID 10.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">4. Comprendre Netplan sous Ubuntu<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Ubuntu utilise Netplan depuis Ubuntu 18.04.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Netplan g\u00e9n\u00e8re automatiquement la configuration pour :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>systemd-networkd ;<\/li>\n\n\n\n<li>NetworkManager.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Sur un serveur Ubuntu, Netplan utilise g\u00e9n\u00e9ralement :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>renderer: networkd<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Les fichiers de configuration se trouvent dans :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/netplan\/<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/netplan\/00-installer-config.yaml<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Netplan utilise le format YAML. L\u2019indentation est donc extr\u00eamement importante.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">5. Installer les outils n\u00e9cessaires<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Ubuntu Server installe g\u00e9n\u00e9ralement Netplan par d\u00e9faut.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00e9rifie sa pr\u00e9sence :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>netplan --version<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Installe les outils r\u00e9seau utiles :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt update<br>sudo apt install vlan iproute2 net-tools<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Explications :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>vlan<\/code> : outils VLAN Linux ;<\/li>\n\n\n\n<li><code>iproute2<\/code> : commandes modernes r\u00e9seau ;<\/li>\n\n\n\n<li><code>net-tools<\/code> : anciennes commandes comme <code>ifconfig<\/code>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Charge le module VLAN du noyau :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo modprobe 8021q<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Pour charger automatiquement le module au d\u00e9marrage :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>echo \"8021q\" | sudo tee -a \/etc\/modules<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">6. Identifier les interfaces r\u00e9seau<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Liste les interfaces disponibles :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ip link show<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2: ens18: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ici :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>ens18<\/code> est l\u2019interface physique ;<\/li>\n\n\n\n<li>elle servira de support aux VLAN.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tu peux \u00e9galement afficher les adresses IP :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ip addr show<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">7. Configurer un VLAN avec Netplan<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Netplan configure les VLAN dans la section :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vlans:<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Syntaxe g\u00e9n\u00e9rale :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vlans:<br>  nom_interface_vlan:<br>    id: ID_VLAN<br>    link: interface_physique<br>    addresses:<br>      - adresse_ip<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vlans:<br>  ens18.10:<br>    id: 10<br>    link: ens18<br>    addresses:<br>      - 192.168.10.10\/24<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">8. Exemple complet de configuration<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Synth\u00e8se Markdown pour ta fiche bristol<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code># VLAN Ubuntu Netplan<br><br>## Module VLAN<br>sudo modprobe 8021q<br><br>## V\u00e9rifier les interfaces<br>ip link show<br><br>## Fichier Netplan<br>\/etc\/netplan\/00-installer-config.yaml<br><br>## Exemple VLAN<br>vlans:<br>  ens18.10:<br>    id: 10<br>    link: ens18<br>    addresses:<br>      - 192.168.10.10\/24<br><br>## Tester configuration<br>sudo netplan try<br><br>## Appliquer configuration<br>sudo netplan apply<br><br>## V\u00e9rifier VLAN<br>ip -d link show<br><br>## V\u00e9rifier IP<br>ip addr show<br><br>## V\u00e9rifier routes<br>ip route<br><br>## Red\u00e9marrer r\u00e9seau<br>sudo systemctl restart systemd-networkd<br><br>## Firewall UFW<br>sudo ufw allow from 192.168.10.0\/24<br><br>## Logs r\u00e9seau<br>journalctl -u systemd-networkd<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Configuration compl\u00e8te Netplan<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>network:<br>  version: 2<br>  renderer: networkd<br><br>  ethernets:<br>    ens18:<br>      dhcp4: no<br><br>  vlans:<br>    ens18.10:<br>      id: 10<br>      link: ens18<br>      addresses:<br>        - 192.168.10.10\/24<br>      routes:<br>        - to: default<br>          via: 192.168.10.254<br>      nameservers:<br>        addresses:<br>          - 1.1.1.1<br>          - 8.8.8.8<br><br>    ens18.20:<br>      id: 20<br>      link: ens18<br>      addresses:<br>        - 192.168.20.10\/24<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Explications :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>id<\/code> : num\u00e9ro du VLAN ;<\/li>\n\n\n\n<li><code>link<\/code> : interface physique ;<\/li>\n\n\n\n<li><code>addresses<\/code> : adresse IP ;<\/li>\n\n\n\n<li><code>routes<\/code> : passerelle ;<\/li>\n\n\n\n<li><code>nameservers<\/code> : DNS.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Teste toujours la configuration avant validation :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo netplan try<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Puis applique :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo netplan apply<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">9. Fichiers importants<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Configuration Netplan<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/netplan\/*.yaml<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Modules noyau<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/modules<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9solution DNS<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/resolv.conf<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Configuration systemd-networkd<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/run\/systemd\/network\/<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Logs syst\u00e8me<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/var\/log\/syslog<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">10. V\u00e9rifier le fonctionnement<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Afficher les VLAN :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ip -d link show<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Afficher les adresses IP :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ip addr show<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Afficher les routes :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ip route<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Tester la connectivit\u00e9 :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ping 192.168.10.254<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Tester la r\u00e9solution DNS :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ping google.com<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">11. Cas concrets d\u2019utilisation<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Serveur multi-r\u00e9seaux<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un serveur peut appartenir \u00e0 plusieurs VLAN :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VLAN administration ;<\/li>\n\n\n\n<li>VLAN sauvegarde ;<\/li>\n\n\n\n<li>VLAN production.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Hyperviseur Proxmox<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les machines virtuelles utilisent diff\u00e9rents VLAN via le m\u00eame port physique.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Infrastructure entreprise<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">S\u00e9paration :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>utilisateurs ;<\/li>\n\n\n\n<li>serveurs ;<\/li>\n\n\n\n<li>VoIP ;<\/li>\n\n\n\n<li>Wi-Fi invit\u00e9.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">12. Pare-feu et s\u00e9curit\u00e9<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Les VLAN segmentent le r\u00e9seau mais ne remplacent pas un pare-feu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ubuntu utilise souvent UFW.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Autoriser uniquement un VLAN<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ufw allow from 192.168.10.0\/24<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Autoriser SSH uniquement sur un VLAN d\u2019administration<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ufw allow from 192.168.10.0\/24 to any port 22 proto tcp<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Bloquer un r\u00e9seau<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ufw deny from 192.168.20.0\/24<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e9rifier les r\u00e8gles<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ufw status verbose<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ports concern\u00e9s :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Service<\/th><th>Port<\/th><\/tr><\/thead><tbody><tr><td>SSH<\/td><td>22<\/td><\/tr><tr><td>DNS<\/td><td>53<\/td><\/tr><tr><td>HTTP<\/td><td>80<\/td><\/tr><tr><td>HTTPS<\/td><td>443<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Attention :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>un switch doit autoriser les VLAN sur le port trunk ;<\/li>\n\n\n\n<li>le serveur doit utiliser le m\u00eame ID VLAN ;<\/li>\n\n\n\n<li>le firewall peut bloquer les \u00e9changes m\u00eame si le VLAN fonctionne.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">13. Commandes utiles et d\u00e9pannage<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Tester la syntaxe Netplan<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo netplan generate<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Tester temporairement<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo netplan try<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Cette commande revient automatiquement \u00e0 l\u2019ancienne configuration si le r\u00e9seau ne r\u00e9pond plus.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Appliquer d\u00e9finitivement<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo netplan apply<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Red\u00e9marrer le service r\u00e9seau<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl restart systemd-networkd<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e9rifier l\u2019\u00e9tat du service<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>systemctl status systemd-networkd<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Voir les interfaces VLAN<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>networkctl status<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Capturer les trames VLAN<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo tcpdump -i ens18 -e vlan<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Explications :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>-i<\/code> : interface ;<\/li>\n\n\n\n<li><code>-e<\/code> : affiche les ent\u00eates Ethernet ;<\/li>\n\n\n\n<li><code>vlan<\/code> : filtre VLAN.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">14. Logs r\u00e9seau et analyse<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Lire les logs r\u00e9seau<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -u systemd-networkd<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Suivre les logs en temps r\u00e9el<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -fu systemd-networkd<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Voir les erreurs Netplan<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo netplan --debug apply<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Tu peux y voir :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>erreurs YAML ;<\/li>\n\n\n\n<li>probl\u00e8mes DHCP ;<\/li>\n\n\n\n<li>interfaces absentes ;<\/li>\n\n\n\n<li>routes invalides ;<\/li>\n\n\n\n<li>erreurs DNS.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e9rifier les messages noyau<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>dmesg | grep 8021q<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Tu peux confirmer :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>le chargement du module VLAN ;<\/li>\n\n\n\n<li>les erreurs pilotes r\u00e9seau ;<\/li>\n\n\n\n<li>les interfaces cr\u00e9\u00e9es.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">15. Erreurs fr\u00e9quentes<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Mauvaise indentation YAML<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Erreur classique :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vlans:<br>ens18.10:<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Correction :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vlans:<br>  ens18.10:<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Mauvais nom d\u2019interface<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Toujours v\u00e9rifier avec :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ip link show<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">VLAN absent sur le switch<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le serveur peut \u00eatre correct mais le switch bloque le VLAN.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Oubli du module 8021q<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sans ce module, Linux ne g\u00e8re pas les VLAN.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Passerelle incorrecte<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Une mauvaise route emp\u00eache l\u2019acc\u00e8s Internet.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">16. Bonnes pratiques<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Utilise des VLAN clairement document\u00e9s.<\/li>\n\n\n\n<li>S\u00e9pare administration et production.<\/li>\n\n\n\n<li>Teste toujours avec <code>netplan try<\/code>.<\/li>\n\n\n\n<li>Sauvegarde les fichiers YAML avant modification.<\/li>\n\n\n\n<li>Limite les acc\u00e8s SSH avec UFW.<\/li>\n\n\n\n<li>Documente les ID VLAN utilis\u00e9s.<\/li>\n\n\n\n<li>\u00c9vite les VLAN inutilis\u00e9s sur les trunks.<\/li>\n\n\n\n<li>V\u00e9rifie r\u00e9guli\u00e8rement les logs r\u00e9seau.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">17. Pour aller plus loin<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Tu peux approfondir :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>le routage inter-VLAN ;<\/li>\n\n\n\n<li>les bridges Linux ;<\/li>\n\n\n\n<li>les bonds r\u00e9seau ;<\/li>\n\n\n\n<li>VXLAN ;<\/li>\n\n\n\n<li>Open vSwitch ;<\/li>\n\n\n\n<li>l\u2019int\u00e9gration avec Proxmox ;<\/li>\n\n\n\n<li>l\u2019automatisation Ansible.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tu peux \u00e9galement \u00e9tudier :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>le fonctionnement des trunks ;<\/li>\n\n\n\n<li>STP ;<\/li>\n\n\n\n<li>LACP ;<\/li>\n\n\n\n<li>les ACL r\u00e9seau ;<\/li>\n\n\n\n<li>le filtrage ebtables\/nftables.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">18. Liens vers : les sites officiels, les mooc ou autres contenus p\u00e9dagogiques qui font r\u00e9f\u00e9rences, etc<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Documentation officielle Netplan<\/h2>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/netplan.readthedocs.io\/en\/stable\/netplan-yaml\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Documentation officielle compl\u00e8te du format YAML utilis\u00e9 par Ubuntu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Documentation Ubuntu Network Configuration<\/h2>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/ubuntu.com\/server\/docs\/network-configuration\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Guide officiel Ubuntu Server pour la configuration r\u00e9seau.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Documentation Debian VLAN<\/h2>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/wiki.debian.org\/fr\/NetworkConfiguration#VLAN\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Explications Debian sur la gestion des VLAN.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">RFC IEEE 802.1Q<\/h2>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/standards.ieee.org\/ieee\/802.1Q\/7024\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Norme officielle des VLAN Ethernet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OpenClassrooms \u2014 D\u00e9couvrez les r\u00e9seaux informatiques<\/h2>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/openclassrooms.com\/fr\/courses\/6944606-initiez-vous-aux-reseaux-informatiques\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00e8s bon cours pour comprendre les bases r\u00e9seau avant les VLAN.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OpenClassrooms \u2014 Administrez Linux<\/h2>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/openclassrooms.com\/fr\/courses\/7172076-administrez-un-systeme-linux\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Excellente ressource pour apprendre les commandes Linux syst\u00e8me et r\u00e9seau.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Documentation systemd-networkd<\/h2>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/www.freedesktop.org\/software\/systemd\/man\/systemd-networkd.service.html\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Documentation officielle du backend utilis\u00e9 par Netplan.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">19. Id\u00e9es de TP<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">TP 1 \u2014 Cr\u00e9ation d\u2019un VLAN simple<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Objectifs :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cr\u00e9er un VLAN 10 ;<\/li>\n\n\n\n<li>configurer une IP statique ;<\/li>\n\n\n\n<li>tester la connectivit\u00e9.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">TP 2 \u2014 Communication inter-VLAN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Objectifs :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cr\u00e9er VLAN 10 et VLAN 20 ;<\/li>\n\n\n\n<li>mettre un routeur Linux ;<\/li>\n\n\n\n<li>tester les flux r\u00e9seau.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">TP 3 \u2014 S\u00e9curisation SSH par VLAN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Objectifs :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>autoriser SSH uniquement depuis VLAN admin ;<\/li>\n\n\n\n<li>configurer UFW ;<\/li>\n\n\n\n<li>tester les blocages.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">TP 4 \u2014 Analyse r\u00e9seau VLAN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Objectifs :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>utiliser <code>tcpdump<\/code> ;<\/li>\n\n\n\n<li>observer les tags VLAN ;<\/li>\n\n\n\n<li>identifier les trames 802.1Q.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">TP 5 \u2014 D\u00e9pannage Netplan<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Objectifs :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>corriger une erreur YAML ;<\/li>\n\n\n\n<li>analyser les logs ;<\/li>\n\n\n\n<li>restaurer le r\u00e9seau.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>1. Introduction Dans un environnement professionnel, tu vas souvent devoir segmenter le r\u00e9seau pour s\u00e9parer les usages, am\u00e9liorer la s\u00e9curit\u00e9 ou organiser les services. Les VLAN (Virtual LAN) permettent justement de cr\u00e9er plusieurs r\u00e9seaux logiques sur une m\u00eame infrastructure physique. Sous Ubuntu Server, la configuration r\u00e9seau moderne repose principalement sur Netplan. Cet outil simplifie la [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[23,12,26,10,25,20],"tags":[],"class_list":["post-388","post","type-post","status-publish","format-standard","hentry","category-8021q","category-linux","category-netplan","category-reseau","category-ubuntu","category-vlan"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fiche vlan sur ubuntu avec netplan - Eryann Breizh SecOps<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eryann.fr\/index.php\/8021q\/fiche-vlan-sur-ubuntu-avec-netplan\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche vlan sur ubuntu avec netplan - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"1. Introduction Dans un environnement professionnel, tu vas souvent devoir segmenter le r\u00e9seau pour s\u00e9parer les usages, am\u00e9liorer la s\u00e9curit\u00e9 ou organiser les services. Les VLAN (Virtual LAN) permettent justement de cr\u00e9er plusieurs r\u00e9seaux logiques sur une m\u00eame infrastructure physique. Sous Ubuntu Server, la configuration r\u00e9seau moderne repose principalement sur Netplan. 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Introduction Dans un environnement professionnel, tu vas souvent devoir segmenter le r\u00e9seau pour s\u00e9parer les usages, am\u00e9liorer la s\u00e9curit\u00e9 ou organiser les services. Les VLAN (Virtual LAN) permettent justement de cr\u00e9er plusieurs r\u00e9seaux logiques sur une m\u00eame infrastructure physique. Sous Ubuntu Server, la configuration r\u00e9seau moderne repose principalement sur Netplan. 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