Configurer un VPN WireGuard

Why WireGuard

The safest way to reach your home server from outside is not to expose each service to the internet, but to connect into your network through a VPN. WireGuard is the modern choice: it's extremely fast, uses state-of-the-art cryptography, and has tiny, readable configs. Once connected, you use your services exactly as if you were at home.

This tutorial uses wg-easy, a container that gives WireGuard a simple web UI and QR codes for clients.

Prerequisites

• A server reachable from the internet — either a public IP with port forwarding, or a small cloud VPS as an entry point.
• A dynamic DNS hostname if your home IP changes (see Dynamic DNS).
• Docker.

Step 1: Forward the WireGuard port

On your router, forward UDP port 51820 to your server. WireGuard uses UDP only — there's nothing to see if someone port-scans it, which is part of its appeal.

Step 2: Deploy wg-easy

services:
  wg-easy:
    image: ghcr.io/wg-easy/wg-easy:latest
    container_name: wg-easy
    restart: unless-stopped
    environment:
      - WG_HOST=vpn.example.com      # your public hostname or IP
      - PASSWORD_HASH=REPLACE_ME     # bcrypt hash for the web UI
      - WG_DEFAULT_DNS=192.168.1.10  # your Pi-hole/AdGuard, optional
    ports:
      - "51820:51820/udp"
      - "51821:tcp"                  # web UI (keep internal)
    volumes:
      - ./config:/etc/wireguard
    cap_add:
      - NET_ADMIN
      - SYS_MODULE
    sysctls:
      - net.ipv4.ip_forward=1

Set WG_HOST to how clients reach you, and generate a bcrypt hash for PASSWORD_HASH. Start it:

docker compose up -d

Step 3: Create clients

Open the web UI at http://your-server-ip:51821 (keep this port internal — don't forward it). Create a client for each device. wg-easy shows a QR code:

• Phone: install the WireGuard app and scan the QR code.
• Laptop: download the config file and import it into the WireGuard client.

Step 4: Choose split vs. full tunnel

Each client's AllowedIPs decides what goes through the VPN:

• Split tunnel (AllowedIPs = 192.168.1.0/24) — only home-network traffic uses the VPN; your normal browsing goes out directly. Best for everyday remote access.
• Full tunnel (AllowedIPs = 0.0.0.0/0) — all traffic routes through home. Useful on untrusted Wi-Fi and to use your Pi-hole everywhere.

Step 5: Test it

Turn off Wi-Fi on your phone (use mobile data), enable the WireGuard tunnel, and try reaching an internal service by its LAN IP or internal hostname. If it loads, you're done — your homelab is now reachable securely from anywhere.

WireGuard vs. Tailscale

wg-easy is self-hosted WireGuard with full control. If you want automatic NAT traversal without port forwarding and near-zero setup, Tailscale (which is built on WireGuard) is worth considering — see Tailscale vs WireGuard.

Security notes

• Keep the wg-easy web UI off the internet — only 51820/udp should be forwarded.
• Give each device its own client config so you can revoke one without disrupting others.
• Consider routing clients' DNS through your Pi-hole for ad-blocking on the go.

Troubleshooting

• Handshake but no traffic — check AllowedIPs and that IP forwarding is enabled.
• No handshake at all — the UDP port isn't forwarded, or WG_HOST is wrong.
• Works on Wi-Fi, not mobile — confirm the public hostname/IP resolves from outside your network.

Next steps

With a VPN in place, you can safely keep dashboards like Portainer and Proxmox internal-only, exposing nothing to the public internet.