diff --git a/configuration.nix b/configuration.nix
index b1dd1d6..859a67d 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -75,4 +75,25 @@
   users.groups.docker.members = [ "nicole" ];
   programs.virt-manager.enable = true;
 
+
+  #### nix-Cache
+
+  # --- Binary-Cache -------------------------------------------------------------
+  services.nix-serve = {
+    enable          = true;
+    secretKeyFile   = "/var/cache/nix/secret-key";
+    openFirewall    = true;
+    port            = 5000;
+  };
+  
+  nix.settings = {
+    substituters        = [ "http://nix-nas:5000" "https://cache.nixos.org" ];
+    trusted-public-keys = [
+      "nas-cache:rgCDn9SwmvxvhjiEiRgrjAuAEyRiJT/aBIlywetuypM="
+      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="      # Standard-Key vom upstream Cache
+    ];
+    secret-key-files    = [ "/var/cache/nix/secret-key" ];
+  };
+
+
 }