diff --git a/hosts/frikandel/wireguard.nix b/hosts/frikandel/wireguard.nix
index af739ad..ff4aa9a 100644
--- a/hosts/frikandel/wireguard.nix
+++ b/hosts/frikandel/wireguard.nix
@@ -16,7 +16,7 @@
   networking.nat = {
     enable = true;
     enableIPv6 = true;
-    internalInterfaces = [ "wg-server" ];
+    internalInterfaces = [ "wg0" ];
   };
 
   networking.firewall.allowedUDPPorts = [ 51899 ];
diff --git a/modules/nix/default.nix b/modules/nix/default.nix
index 89464f2..ab92f97 100644
--- a/modules/nix/default.nix
+++ b/modules/nix/default.nix
@@ -30,6 +30,14 @@
       trusted-users = ["root" "@wheel"];
       # Allow only group wheel to connect to the nix daemon
       allowed-users = ["@wheel"];
+
+      substituters = [
+        "https://pub-solar.cachix.org/"
+      ];
+
+      trusted-public-keys = [
+        "pub-solar.cachix.org-1:ZicXIxKgdxMtgSJECWR8iihZxHRvu8ObL4n2cuBmtos="
+      ];
     };
 
     # Generally useful nix option defaults