diff --git a/nixos/default.nix b/nixos/default.nix
index 3183b13..8bb663c 100644
--- a/nixos/default.nix
+++ b/nixos/default.nix
@@ -11,6 +11,7 @@
 
 	networking.useDHCP = false;
 	networking.firewall.enable = true; # is already enabled ...
+	networking.firewall.allowedUDPPorts = [ 5355 ]; # LLMNR
 
 	services.openssh = {
 		enable = true;