os/hosts/norman/wireguard.nix

{
  config,
  pkgs,
  ...
}: {
  systemd.services.wireguard-wg0.serviceConfig.Restart = "on-failure";
  systemd.services.wireguard-wg0.serviceConfig.RestartSec = "5s";
  systemd.services.wireguard-wg1.serviceConfig.Restart = "on-failure";
  systemd.services.wireguard-wg1.serviceConfig.RestartSec = "5s";

  # Enable WireGuard
  networking.wireguard.interfaces = {
    # "wg0" is the network interface name. You can name the interface arbitrarily.
    wg0 = {
      # Determines the IP address and subnet of the client's end of the tunnel interface.
      ips = [
        "10.0.0.13/32"
        "fc00:200::13/128"
      ];
      mtu = 1400;
      listenPort = 51820; # to match firewall allowedUDPPorts (without this wg uses random port numbers)

      # Path to the private key file.
      #
      # Note: The private key can also be included inline via the privateKey option,
      # but this makes the private key world-readable; thus, using privateKeyFile is
      # recommended.
      privateKeyFile = "/home/hensoko/.config/wireguard/hosting-de.private";

      peers = [
        # For a client configuration, one peer entry for the server will suffice.

        {
          # Public key of the server (not a file path).
          publicKey = "02/MRPduMGx1as7yS4G7GpL4+pQjsjpyS/tD9iPu8X0=";

          # Forward all the traffic via VPN.
          allowedIPs = [
            "10.0.0.0/24"
            "192.168.50.0/24"
            "192.168.200.0/24"
            "10.20.30.0/24"
            "10.20.50.0/24"
            "fc00:200::/120"
            "95.129.51.5"
            "95.129.54.43"
            "134.0.28.89"
            "134.0.27.108"
            "134.0.25.181"
          ];

          # Set this to the server IP and port.
          endpoint = "134.0.30.154:51820"; # ToDo: route to endpoint not automatically configured https://wiki.archlinux.org/index.php/WireGuard#Loop_routing https://discourse.nixos.org/t/solved-minimal-firewall-setup-for-wireguard-client/7577

          # Send keepalives every 25 seconds. Important to keep NAT tables alive.
          persistentKeepalive = 25;
        }
      ];
    };
    wg1 = {
      # Determines the IP address and subnet of the client's end of the tunnel interface.
      ips = [
        "10.0.1.121"
      ];
      mtu = 1400;
      listenPort = 51821; # to match firewall allowedUDPPorts (without this wg uses random port numbers)

      # Path to the private key file.
      #
      # Note: The private key can also be included inline via the privateKey option,
      # but this makes the private key world-readable; thus, using privateKeyFile is
      # recommended.
      privateKeyFile = "/home/hensoko/.config/wireguard/data-gssws-de.private";

      peers = [
        # For a client configuration, one peer entry for the server will suffice.

        {
          # Public key of the server (not a file path).
          publicKey = "t1DS0y6eVzyGwomKAEWTWVsHK3xB7M/fNQ3wLgE3+B8=";

          allowedIPs = [
            "10.0.1.0/24"
          ];

          # Set this to the server IP and port.
          endpoint = "80.244.242.2:51899";

          # Send keepalives every 25 seconds. Important to keep NAT tables alive.
          persistentKeepalive = 25;
        }
      ];
    };
  };
}