diff --git a/modules/default.nix b/modules/default.nix
index 243e91e..f67a5bc 100644
--- a/modules/default.nix
+++ b/modules/default.nix
@@ -97,6 +97,12 @@ in
       # wireguard tunnel does not work.
       networking.firewall.checkReversePath = false;
 
+      # Open ports for quick tests
+      networking.firewall = {
+        allowedTCPPortRanges = lib.singleton { from = 9990; to = 9999; };
+        allowedUDPPortRanges = lib.singleton { from = 9990; to = 9999; };
+      };
+
       nix = {
         nixPath = [
           "/var/src" # pinned nixpkgs and configuration