diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index fea6858..0d5dd03 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -10,6 +10,15 @@
       ./hardware-configuration.nix
     ];
 
+  # Firewall
+  networking.firewall = {
+	  enable = true;
+	  allowedTCPPorts = [ 30000 ];
+	  allowedUDPPortRanges = [
+	    { from = 4000; to = 4007; }
+	    { from = 8000; to = 8010; }
+	  ];
+  };
 
   # Keychain
   services.gnome.gnome-keyring.enable = true;