diff --git a/hosts/containers/matemat/default.nix b/hosts/containers/matemat/default.nix
new file mode 100644
index 00000000..84b6dad2
--- /dev/null
+++ b/hosts/containers/matemat/default.nix
@@ -0,0 +1,4 @@
+{ ... }:
+{
+  c3d2 = { isInHq = true; };
+}
diff --git a/lib/default-gateway.nix b/lib/default-gateway.nix
index 5854bca3..2acfb5dd 100644
--- a/lib/default-gateway.nix
+++ b/lib/default-gateway.nix
@@ -1,5 +1,6 @@
 { config, pkgs, lib, strings, ... }:
 
+lib.optional !config.networking.useNetworkd
 {
   networking.defaultGateway = "172.22.99.4";
 }