diff --git a/config/hardware/spark.nix b/config/hardware/spark.nix
index d302722..24cd42c 100644
--- a/config/hardware/spark.nix
+++ b/config/hardware/spark.nix
@@ -41,7 +41,7 @@
 
   networking = {
     macvlans = {
-      extif0 = {
+      intif0 = {
         interface = "enp3s0";
         mode = "bridge";
       };
@@ -52,9 +52,8 @@
         useDHCP = false;
       };
       
-      extif0 = {
-        # output of: echo spark-extif0|md5sum|sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:\1:\2:\3:\4:\5/'
-        macAddress = "02:9c:b7:b6:ad:c4";
+      intif0 = {
+        macAddress = pkgs.lib.network.generate-mac-address config.instance.hostname "intif0";
       };
     };
   };
diff --git a/config/host-config/spark.nix b/config/host-config/spark.nix
index e52d8a2..02a2d87 100644
--- a/config/host-config/spark.nix
+++ b/config/host-config/spark.nix
@@ -5,7 +5,7 @@
 
   networking = {
     interfaces = {
-      extif0 = { useDHCP = true; };
+      intif0.useDHCP = true;
     };
   };