diff --git a/hosts/carbon/configuration.nix b/hosts/carbon/configuration.nix
index 08bb266..63a8393 100644
--- a/hosts/carbon/configuration.nix
+++ b/hosts/carbon/configuration.nix
@@ -7,6 +7,7 @@
       ../../configuration/router
 
       ./dns.nix
+      ./net-heimnetz.nix
       ./ppp.nix
     ];
 
@@ -47,23 +48,6 @@
     id = 102;
     interface = "enp1s0";
   };
-  ## Heimnetz
-  networking.vlans."enp1s0.201" = {
-    id = 201;
-    interface = "enp1s0";
-  };
-  networking.bridges."net-heimnetz".interfaces = [
-    "enp1s0.201"
-    "enp2s0"
-  ];
-  networking.interfaces."net-heimnetz".ipv6.addresses = [
-    { address = "fe80::1"; prefixLength = 64; }
-    { address = "fd00:152:152:4::1"; prefixLength = 64; }
-    { address = "2001:4cd8:100:1337::1"; prefixLength = 64; } # public IPs for local network
-  ];
-  networking.interfaces."net-heimnetz".ipv4.addresses = [
-    { address = "10.152.4.1"; prefixLength = 24; }
-  ];
   ## Gastnetz
   networking.vlans."enp1s0.202" = {
     id = 202;
@@ -98,12 +82,6 @@
 
   services.radvd.enable = true;
   services.radvd.config = ''
-    interface net-heimnetz {
-      AdvSendAdvert on;
-      prefix 2001:4cd8:100:1337::/64 {};
-      RDNSS fd00:152:152::1 {};
-      DNSSL net.clerie.de {};
-    };
     interface enp1s0.202 {
       AdvSendAdvert on;
       prefix 2001:4cd8:100:1313::/64 {};
@@ -115,7 +93,7 @@
     enable = true;
     settings = {
       interfaces-config = {
-        interfaces = [ "net-heimnetz" "enp1s0.202" "enp1s0.204" ];
+        interfaces = [ "enp1s0.202" "enp1s0.204" ];
         service-sockets-max-retries = 15;
         service-sockets-retry-wait-time = 2000;
       };
@@ -164,30 +142,6 @@
         }
       ];
       subnet4 = [
-        # Heimnetz
-        {
-          id = 201;
-          subnet = "10.152.4.0/24";
-          pools = [
-            {
-              pool = "10.152.4.100 - 10.152.4.240";
-            }
-          ];
-          option-data = [
-            {
-              name = "routers";
-              data = "10.152.4.1";
-            }
-            {
-              name = "domain-name-servers";
-              data = "10.152.0.1";
-            }
-            {
-              name = "domain-name";
-              data = "net.clerie.de";
-            }
-          ];
-        }
         # Gastnetz
         {
           id = 202;
diff --git a/hosts/carbon/net-heimnetz.nix b/hosts/carbon/net-heimnetz.nix
new file mode 100644
index 0000000..60e0bc6
--- /dev/null
+++ b/hosts/carbon/net-heimnetz.nix
@@ -0,0 +1,66 @@
+{ ... }:
+
+{
+
+  ## Heimnetz
+  networking.vlans."enp1s0.201" = {
+    id = 201;
+    interface = "enp1s0";
+  };
+  networking.bridges."net-heimnetz".interfaces = [
+    "enp1s0.201"
+    "enp2s0"
+  ];
+  networking.interfaces."net-heimnetz".ipv6.addresses = [
+    { address = "fe80::1"; prefixLength = 64; }
+    { address = "fd00:152:152:4::1"; prefixLength = 64; }
+    { address = "2001:4cd8:100:1337::1"; prefixLength = 64; } # public IPs for local network
+  ];
+  networking.interfaces."net-heimnetz".ipv4.addresses = [
+    { address = "10.152.4.1"; prefixLength = 24; }
+  ];
+
+  services.radvd.config = ''
+    interface net-heimnetz {
+      AdvSendAdvert on;
+      prefix 2001:4cd8:100:1337::/64 {};
+      RDNSS fd00:152:152::1 {};
+      DNSSL net.clerie.de {};
+    };
+  '';
+
+  services.kea.dhcp4 = {
+    settings = {
+      interfaces-config = {
+        interfaces = [ "net-heimnetz" ];
+      };
+      subnet4 = [
+        # Heimnetz
+        {
+          id = 201;
+          subnet = "10.152.4.0/24";
+          pools = [
+            {
+              pool = "10.152.4.100 - 10.152.4.240";
+            }
+          ];
+          option-data = [
+            {
+              name = "routers";
+              data = "10.152.4.1";
+            }
+            {
+              name = "domain-name-servers";
+              data = "10.152.0.1";
+            }
+            {
+              name = "domain-name";
+              data = "net.clerie.de";
+            }
+          ];
+        }
+      ];
+    };
+  };
+
+}