server: switch to systemd-networkd

system/devices/radxa-rock5a-server.nix

@@ -35,8 +35,6 @@ in
     "net.ipv4.tcp_congestion_control" = "bbr";
   };
 
-  networking.useDHCP = true;
-  /*
   # as expected, systemd initrd and networking didn't work well, and i really cba to debug it
   networking.useDHCP = false;
   networking.useNetworkd = true;
@@ -52,8 +50,18 @@ in
     networks."10-dhcp" = {
       DHCP = "yes";
       name = "e*";
+      networkConfig = {
+        IPv6AcceptRA = "yes";
+      };
+      dhcpV4Config = {
+        ClientIdentifier = "mac";
+        DUIDType = "link-layer";
+      };
+      dhcpV6Config = {
+        DUIDType = "link-layer";
+      };
+    };
   };
-  };*/
 
   boot.initrd = {
     /*systemd = {
@@ -79,10 +87,12 @@ in
     preLVMCommands = lib.mkOrder 499 ''
       ip link set end0 address ${router-config.router-settings.serverInitrdMac} || ip link set eth0 address ${router-config.router-settings.serverInitrdMac} || true
     '';
-    postMountCommands = ''
-      ip link set end0 address ${router-config.router-settings.serverMac} || ip link set eth0 address ${router-config.router-settings.serverInitrdMac} || true
-    '';
+    # postMountCommands = ''
+    #   ip link set end0 address ${router-config.router-settings.serverMac} || ip link set eth0 address ${router-config.router-settings.serverMac} || true
+    # '';
     network.enable = true;
+    network.flushBeforeStage2 = true;
+    network.udhcpc.enable = true;
     network.udhcpc.extraArgs = [ "-t100" ];
     network.ssh = {
       enable = true;

system/hosts/router/default.nix

@@ -296,6 +296,7 @@ in {
     { ipAddress = lightBulbAddress6;
       macAddress = cfg.lightBulbMac; }
     { ipAddress = serverInitrdAddress6;
+      duid = cfg.serverInitrdDuid;
       macAddress = cfg.serverInitrdMac; }
   ];
 

system/hosts/router/options.nix

@@ -70,6 +70,11 @@
       description = "server's mac address in initrd";
       type = lib.types.str;
     };
+    serverInitrdDuid = lib.mkOption {
+      description = "server's duid in initrd";
+      type = with lib.types; nullOr str;
+      default = null;
+    };
     vacuumMac = lib.mkOption {
       description = "robot vacuum's mac address";
       type = lib.types.str;