diff --git a/terraform/environments/dev/main.tf b/terraform/environments/dev/main.tf
index e69de29..0deb0ff 100644
--- a/terraform/environments/dev/main.tf
+++ b/terraform/environments/dev/main.tf
@@ -0,0 +1,27 @@
+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 6.0"
+    }
+  }
+}
+
+provider "google" {
+  project = var.project_name
+  region  = var.region
+}
+
+module "network" {
+  source = "./modules/network"
+
+  #variables d'entrée
+  project_name = var.project_name
+  region = var.region
+
+  #autres variables spécifiques au module
+  frontend_cidr = var.frontend_cidr
+  backend_cidr = var.backend_cidr
+  database_cidr = var.database_cidr
+  ssh_source_ranges = var.ssh_source_ranges
+}
\ No newline at end of file
diff --git a/terraform/environments/dev/variables.tf b/terraform/environments/dev/variables.tf
index e69de29..eee90eb 100644
--- a/terraform/environments/dev/variables.tf
+++ b/terraform/environments/dev/variables.tf
@@ -0,0 +1,35 @@
+variable "project_name" {
+    description = "nom du projet"
+    type        = string
+    default     = "projet-vertu"
+}
+
+variable "region" {
+    description = "region"
+    type        = string
+    default     = "europe-west4"
+}
+
+variable "frontend_cidr" {
+    description = "sous réseau frontend"
+    type        = string
+    default     = "10.0.1.0/24"
+}
+
+variable "backend_cidr" {
+    description = "sous réseau backend"
+    type        = string
+    default     = "10.0.2.0/24"
+}
+
+variable "database_cidr" {
+    description = "sous réseau database"
+    type        = string
+    default     = "10.0.3.0/24" 
+}
+
+variable "ssh_source_ranges" {
+    description = "ssh"
+    type        = string
+    default     = "0.0.0.0/0"
+}
\ No newline at end of file
diff --git a/terraform/modules/network/main.tf b/terraform/modules/network/main.tf
index e69de29..3b131cb 100644
--- a/terraform/modules/network/main.tf
+++ b/terraform/modules/network/main.tf
@@ -0,0 +1,82 @@
+# VPC
+resource "google_compute_network" "tp7" {
+  name                    = "tp7"
+  auto_create_subnetworks = false
+}
+
+# Sous-réseau frontend
+resource "google_compute_subnetwork" "frontend" {
+  name          = "frontend"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.frontend_cidr
+  region        = "europe-west4"
+}
+
+# Sous-réseau backend
+resource "google_compute_subnetwork" "backend" {
+  name          = "backend"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.backend_cidr
+  region        = "europe-west4"
+}
+
+# Sous-réseau database
+resource "google_compute_subnetwork" "database" {
+  name          = "database"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.database_cidr
+  region        = "europe-west4"
+}
+
+# Règle de pare-feu
+resource "google_compute_firewall" "allow_ssh" {
+  name    = "allow-ssh"
+  network = google_compute_network.vpc.id
+
+  allow {
+    protocol = "tcp"
+    ports    = ["22"]
+  }
+
+  source_ranges = ["0.0.0.0/0"]
+  target_tags   = ["ssh"]
+}
+
+resource "google_compute_firewall" "allow_http" {
+  name    = "allow-http"
+  network = google_compute_network.vpc.id
+
+  allow {
+    protocol = "tcp"
+    ports    = ["80, 443"]
+  }
+
+  source_ranges = ["0.0.0.0/0"]
+  target_tags   = ["web"]
+}
+
+resource "google_compute_firewall" "allow_front-to-back" {
+  name    = "allow-front-to-back"
+  network = google_compute_network.vpc.id
+
+  allow {
+    protocol = "tcp"
+    ports    = ["8080"]
+  }
+
+  source_ranges = ["frontend"]
+  target_tags   = ["backend"]
+}
+
+resource "google_compute_firewall" "allow_back-to-db" {
+  name    = "allow-back-to-db"
+  network = google_compute_network.vpc.id
+
+  allow {
+    protocol = "tcp"
+    ports    = ["3306"]
+  }
+
+  source_ranges = ["backend"]
+  target_tags   = ["database"]
+}
\ No newline at end of file
diff --git a/terraform/modules/network/variables.tf b/terraform/modules/network/variables.tf
index e69de29..d20c7d0 100644
--- a/terraform/modules/network/variables.tf
+++ b/terraform/modules/network/variables.tf
@@ -0,0 +1,29 @@
+variable "project_name" {
+    description = "nom du projet"
+    type        = string
+}
+
+variable "region" {
+    description = "region"
+    type        = string
+}
+
+variable "frontend_cidr" {
+    description = "sous réseau frontend"
+    type        = string
+}
+
+variable "backend_cidr" {
+    description = "sous réseau backend"
+    type        = string
+}
+
+variable "database_cidr" {
+    description = "sous réseau database"
+    type        = string
+}
+
+variable "ssh_source_ranges" {
+    description = "ssh"
+    type        = string
+}
\ No newline at end of file