hosts/ni: modularize networking configuration

Re-added the setup with the traditional networking configuration since
I'm currently using GNOME which only integrates with NetworkManager
which is working alongside it.

systemd-networkd not being used at this point but I'm keeping it.

hosts/ni/hardware-configuration.nix

@@ -1,7 +1,10 @@
 { config, lib, pkgs, modulesPath, ... }:
 
 {
-  imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+    ./modules/hardware/traditional-networking.nix
+  ];
 
   boot.initrd.availableKernelModules =
     [ "xhci_pci" "ahci" "nvme" "usb_storage" "uas" "sd_mod" ];
@@ -25,54 +28,6 @@
 
   swapDevices = [{ label = "swap"; }];
 
-  networking = {
-    usePredictableInterfaceNames = true;
-    useNetworkd = true;
-
-    # We're using networkd to configure so we're disabling this
-    # service.
-    useDHCP = false;
-    dhcpcd.enable = false;
-  };
-
-  # Enable systemd-resolved. This is mostly setup by `systemd.network.enable`
-  # by we're being explicit just to be safe.
-  services.resolved = {
-    enable = true;
-    llmnr = "true";
-  };
-
-  # Combining my ethernet and wireless network interfaces.
-  systemd.network = {
-    enable = true;
-    netdevs."40-bond1" = {
-      netdevConfig = {
-        Name = "bond1";
-        Kind = "bond";
-      };
-    };
-
-    networks = {
-      "40-bond1" = {
-        matchConfig.Name = "bond1";
-        networkConfig.DHCP = "yes";
-      };
-
-      "40-bond1-dev1" = {
-        matchConfig.Name = "enp1s0";
-        networkConfig.Bond = "bond1";
-      };
-
-      "40-bond1-dev2" = {
-        matchConfig.Name = "wlp2s0";
-        networkConfig = {
-          Bond = "bond1";
-          IgnoreCarrierLoss = "15";
-        };
-      };
-    };
-  };
-
   powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
   hardware.cpu.intel.updateMicrocode = lib.mkDefault true;
 

hosts/ni/modules/hardware/systemd-networkd.nix

@@ -0,0 +1,51 @@
+{ config, options, lib, pkgs, ... }:
+
+{
+  networking = {
+    usePredictableInterfaceNames = true;
+    useNetworkd = true;
+
+    # We're using networkd to configure so we're disabling this
+    # service.
+    useDHCP = false;
+    dhcpcd.enable = false;
+  };
+
+  # Enable systemd-resolved. This is mostly setup by `systemd.network.enable`
+  # by we're being explicit just to be safe.
+  services.resolved = {
+    enable = false;
+    llmnr = "true";
+  };
+
+  # Combining my ethernet and wireless network interfaces.
+  systemd.network = {
+    enable = false;
+    netdevs."40-bond1" = {
+      netdevConfig = {
+        Name = "bond1";
+        Kind = "bond";
+      };
+    };
+
+    networks = {
+      "40-bond1" = {
+        matchConfig.Name = "bond1";
+        networkConfig.DHCP = "yes";
+      };
+
+      "40-bond1-dev1" = {
+        matchConfig.Name = "enp1s0";
+        networkConfig.Bond = "bond1";
+      };
+
+      "40-bond1-dev2" = {
+        matchConfig.Name = "wlp2s0";
+        networkConfig = {
+          Bond = "bond1";
+          IgnoreCarrierLoss = "15";
+        };
+      };
+    };
+  };
+}

hosts/ni/modules/hardware/traditional-networking.nix

@@ -0,0 +1,21 @@
+{ config, options, lib, pkgs, ... }:
+
+{
+  networking = {
+    usePredictableInterfaceNames = true;
+
+    useDHCP = false;
+    dhcpcd.enable = true;
+
+    interfaces.enp1s0.useDHCP = true;
+    interfaces.wlp2s0.useDHCP = true;
+
+    bonds.bond0 = {
+      driverOptions = {
+        miimon = "100";
+        mode = "active-backup";
+      };
+      interfaces = [ "enp1s0" "wlp2s0" ];
+    };
+  };
+}