diff --git a/common.nix b/common.nix
index 78b96db..0aa407b 100644
--- a/common.nix
+++ b/common.nix
@@ -19,12 +19,20 @@
 
   users.mutableUsers = false;
 
+  services.nix-serve = {
+    enable = true;
+    openFirewall = true;
+    secretKeyFile = "/var/cache-priv-key.pem";
+  };
+
   nix = {
     settings = {
       substituters = [
         "https://cache.nixos.org"
         "https://nix-community.cachix.org"
+        #"http://192.168.88.251:5000"
         "http://192.168.88.252:5000"
+        #"http://192.168.88.253:5000"
       ];
       trusted-public-keys = [
         "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
diff --git a/init/chache.pem b/init/chache.pem
new file mode 100644
index 0000000..d19be64
--- /dev/null
+++ b/init/chache.pem
@@ -0,0 +1 @@
+binarycache.example.com:jSyBgFtsYVCEyuoSAf9ItSesIMlyLxoefDuVTGMlgHp9s5mSOZi352nGVJluE01PRY4ACknVku8EF9CROwEyKw==
diff --git a/systems/club-mate/default.nix b/systems/club-mate/default.nix
index b40ebcb..86345a7 100644
--- a/systems/club-mate/default.nix
+++ b/systems/club-mate/default.nix
@@ -76,12 +76,6 @@
     };
   };
 
-  services.nix-serve = {
-    enable = true;
-    openFirewall = true;
-    secretKeyFile = "/var/cache-priv-key.pem";
-  };
-
   environment.systemPackages = with pkgs; [
     grim # screenshot functionality
     slurp # screenshot functionality