diff --git a/lass/2configs/gg23.nix b/lass/2configs/gg23.nix
index 6bcbd7400..51db9a40a 100644
--- a/lass/2configs/gg23.nix
+++ b/lass/2configs/gg23.nix
@@ -2,37 +2,56 @@
 with import <stockholm/lib>;
 
 {
+  systemd.network.networks."50-et0" = {
+    matchConfig.Name = "et0";
+    DHCP = "yes";
+    # dhcpV4Config.UseDNS = false;
+    # dhcpV6Config.UseDNS = false;
+    linkConfig = {
+      RequiredForOnline = "routable";
+    };
+    # networkConfig = {
+    #   LinkLocalAddressing = "no";
+    # };
+    # dhcpV6Config = {
+    #   PrefixDelegationHint = "::/60";
+    # };
+    # networkConfig = {
+    #   IPv6AcceptRA = true;
+    # };
+    # ipv6PrefixDelegationConfig = {
+    #   Managed = true;
+    # };
+  };
+  systemd.network.networks."50-int0" = {
+    name = "int0";
+    address = [
+      "10.42.0.1/24"
+    ];
+    networkConfig = {
+      IPForward = "yes";
+      IPMasquerade = "both";
+      ConfigureWithoutCarrier = true;
+      DHCPServer = "yes";
+      # IPv6SendRA = "yes";
+      # DHCPPrefixDelegation = "yes";
+    };
+  };
   networking.networkmanager.unmanaged = [ "int0" ];
-  networking.interfaces.int0.ipv4.addresses = [{
-    address = "10.42.0.1";
-    prefixLength = 24;
-  }];
+  krebs.iptables.tables.filter.INPUT.rules = [
+    { predicate = "-i int0"; target = "ACCEPT"; }
+  ];
+  krebs.iptables.tables.filter.FORWARD.rules = [
+    { predicate = "-i int0"; target = "ACCEPT"; }
+    { predicate = "-o int0"; target = "ACCEPT"; }
+    { predicate = "-p ipv6-icmp"; target = "ACCEPT"; v4 = false; }
+  ];
+  krebs.iptables.tables.nat.PREROUTING.rules = mkBefore [
+    { v6 = false; predicate = "-s 10.42.0.0/24"; target = "ACCEPT"; }
+  ];
 
   networking.domain = "gg23";
 
-  services.dhcpd4 = {
-    enable = true;
-    interfaces = [ "int0" ];
-    extraConfig = ''
-      option subnet-mask 255.255.255.0;
-      option routers 10.42.0.1;
-      option domain-name-servers 10.42.0.1;
-      subnet 10.42.0.0 netmask 255.255.255.0 {
-        range 10.42.0.100 10.42.0.200;
-      }
-    '';
-    machines = [
-      { ethernetAddress = "a8:a6:48:65:ce:4c"; hostName = "tv"; ipAddress = "10.42.0.3"; }
-      { ethernetAddress = "3c:2a:f4:22:28:37"; hostName = "drucker"; ipAddress = "10.42.0.4"; }
-      { ethernetAddress = "80:7d:3a:67:b7:01"; hostName = "s20-tv"; ipAddress = "10.42.0.10"; }
-      { ethernetAddress = "80:7d:3a:68:04:f0"; hostName = "s20-drucker"; ipAddress = "10.42.0.11"; }
-      { ethernetAddress = "80:7d:3a:68:11:a5"; hostName = "s20-wasch"; ipAddress = "10.42.0.12"; }
-      { ethernetAddress = "80:7d:3a:67:bb:69"; hostName = "s20-stereo"; ipAddress = "10.42.0.13"; }
-      { ethernetAddress = "ec:b5:fa:07:78:16"; hostName = "hue-bridge"; ipAddress = "10.42.0.21"; }
-      { ethernetAddress = "80:8d:b7:c5:80:dc"; hostName = "arubaAP"; ipAddress = "10.42.0.99"; }
-    ];
-  };
-
   services.dnsmasq = {
     enable = true;
     resolveLocalQueries = false;
@@ -45,22 +64,4 @@ with import <stockholm/lib>;
       interface=int0
     '';
   };
-
-  boot.kernel.sysctl."net.ipv4.ip_forward" = 1;
-  krebs.iptables.tables.filter.INPUT.rules = [
-    { predicate = "-i int0 -p udp --dport 53"; target = "ACCEPT"; } # dns
-  ];
-  krebs.iptables.tables.filter.FORWARD.rules = [
-    { v6 = false; predicate = "-d 10.42.0.0/24 -o int0 -m conntrack --ctstate RELATED,ESTABLISHED"; target = "ACCEPT"; }
-    { v6 = false; predicate = "-s 10.42.0.0/24 -i int0"; target = "ACCEPT"; }
-    { v6 = false; predicate = "-o int0"; target = "REJECT --reject-with icmp-port-unreachable"; }
-    { v6 = false; predicate = "-i int0"; target = "REJECT --reject-with icmp-port-unreachable"; }
-  ];
-  krebs.iptables.tables.nat.PREROUTING.rules = mkBefore [
-    { v6 = false; predicate = "-s 10.42.0.0/24"; target = "ACCEPT"; }
-  ];
-  krebs.iptables.tables.nat.POSTROUTING.rules = [
-    { v6 = false; predicate = "-s 10.42.0.0/24 ! -d 10.42.0.0/24"; target = "MASQUERADE"; }
-  ];
 }
-