diff --git a/host-registry.nix b/host-registry.nix
index 0977a649..6f4c8c57 100644
--- a/host-registry.nix
+++ b/host-registry.nix
@@ -19,7 +19,7 @@ rec {
 
     pulsebert = {
       ether = "dc:a6:32:31:b6:32";
-      publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE9RKlt+mIew5epxHt7Gab44yFOdeD+L/EhhA6Ospzyq";
+      publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFQCsDss9Gq3/eTKqpgEwXK+nhnuARS4/kHqF2+laGnp";
       wol = true;
       ip4 = "pulsebert.hq.c3d2.de";
     };
diff --git a/hosts/containers/nix-build/default.nix b/hosts/containers/nix-build/default.nix
index 7c866211..aaaaf905 100644
--- a/hosts/containers/nix-build/default.nix
+++ b/hosts/containers/nix-build/default.nix
@@ -12,6 +12,9 @@
   };
   networking.defaultGateway = "172.22.99.1";
   networking.firewall.allowedTCPPorts = [ 22 ];
+  networking.nameservers = [ "172.20.73.8" "9.9.9.9" ];
+
+  c3d2.users.polygon = true;
   
   imports = [
     ./hardware-configuration.nix