use systemd-networkd

common.nix

@@ -64,9 +64,21 @@ in
   # allow all firmware
   hardware.enableAllFirmware = true;
 
-  # use NetworkManager
+  # use systemd-networkd
   networking.useDHCP = false;
-  networking.networkmanager.enable = true;
+  systemd.network = {
+    enable = true;
+    networks."10-wan" = {
+      networkConfig = {
+        # start a DHCP Client for IPv4 Addressing/Routing
+        DHCP = "ipv4";
+        # accept Router Advertisements for Stateless IPv6 Autoconfiguraton (SLAAC)
+        IPv6AcceptRA = true;
+      };
+      # make routing on this interface a dependency for network-online.target
+      linkConfig.RequiredForOnline = "routable";
+    };
+  };
 
   # ensure firewall is up, allow ssh and http in
   networking.firewall.enable = true;

mini/configuration.nix

@@ -17,6 +17,9 @@
   # host name
   networking.hostName = "mini";
 
+  # main network interface
+  systemd.network.networks."10-wan".matchConfig.Name = "eno1";
+
   # amd graphics
   hardware.opengl.extraPackages = with pkgs; [ amdvlk rocm-opencl-icd rocm-opencl-runtime ];
   hardware.opengl.extraPackages32 = with pkgs.pkgsi686Linux; [ amdvlk ];

neko/configuration.nix

@@ -17,6 +17,9 @@
   # host name
   networking.hostName = "neko";
 
+  # main network interface
+  systemd.network.networks."10-wan".matchConfig.Name = "enp10s0";
+
   # intel graphics
   hardware.opengl.extraPackages = with pkgs; [ intel-media-driver intel-compute-runtime ];
   hardware.opengl.extraPackages32 = with pkgs.pkgsi686Linux; [ intel-media-driver ];