diff --git a/machines/porthos/networking.nix b/machines/porthos/networking.nix
index 760665a..e593eeb 100644
--- a/machines/porthos/networking.nix
+++ b/machines/porthos/networking.nix
@@ -29,4 +29,7 @@
       tunl0.useDHCP = true;
     };
   };
+
+  # Which interface is used to connect to the internet
+  my.networking.externalInterface = "eth0";
 }