Using WireGuard for Site-to-Site VPN

2 min read 7 months ago
Published on May 03, 2024 This response is partially generated with the help of AI. It may contain inaccuracies.

Table of Contents

Tutorial: Setting up Site-to-Site VPN using WireGuard

Step 1: Introduction to WireGuard VPN

  • WireGuard is known for its simplicity, speed, and security in the world of virtual private networks.
  • It allows for interconnecting three networks using its innovative technology.

Step 2: Network Topology Setup

  • Set up a mesh network where each node is interconnected with every other node using point-to-point links.
  • Assign IP addresses to each node in the network (Node 1: 10.1, Node 2: 10.2, Node 3: 10.3).

Step 3: Generating WireGuard Keys

  • Update packages list with apt update.
  • Install WireGuard with apt install wireguard.
  • Generate public and private keys for each server using the wg genkey and wg pubkey commands.

Step 4: Configuring WireGuard Interface

  • Create a configuration file for the WireGuard interface (e.g., wg0).
  • Define interface address, listen port, and peer configurations in the interface file.

Step 5: Peer Configuration

  • Share public keys with other nodes to establish connections securely.
  • Define allowed IPs and exchange keys with each peer node in the configuration file.

Step 6: Endpoint Configuration

  • Add an endpoint field to each peer to specify the IP address and port for sending packets.
  • Update the endpoint field to the most recent source IP and port for correctly authenticated packets.

Step 7: Testing Connectivity

  • Verify connectivity by pinging the VPN IPs of other nodes from each node in the network.
  • Ensure that all nodes can communicate over the WireGuard VPN.

Step 8: Enabling Packet Forwarding

  • Enable packet forwarding on the servers by uncommenting forwarding for IPv4 in the sysctl config.
  • Update the routing table on each node to include the networks of other nodes.

Step 9: Final Testing and Configuration

  • Update the WireGuard configuration on each node to include the peer sections for all interconnected networks.
  • Verify routing rules for all networks are correctly set up on each node.

Step 10: Testing Internet Access

  • Configure NAT on the servers to allow client machines to access the internet.
  • Test internet access on the client machines to ensure the setup is working correctly.

By following these steps, you can successfully set up a site-to-site VPN using WireGuard for enhanced security and connectivity between multiple networks.