Make sure that the firewall is on
diff --git a/modules/firewall.nix b/modules/firewall.nix
new file mode 100644
index 0000000..09045f4
--- /dev/null
+++ b/modules/firewall.nix
@@ -0,0 +1,3 @@
+{
+  networking.firewall.enable = true;
+}