diff --git a/hosts/hydra/configuration.nix b/hosts/hydra/configuration.nix
index 5298d2d0..9dc5ea70 100644
--- a/hosts/hydra/configuration.nix
+++ b/hosts/hydra/configuration.nix
@@ -11,12 +11,15 @@
     ./../../lib/tun.nix
   ];
 
-  services.yggdrasil.config.Peers = [
-    "tcp://[2a03:3b40:fe:ab::1]:46370" # Praha
-    "tcp://ygg.thingylabs.io:443" # Nürnberg
-    "tcp://176.223.130.120:22632" # Wrocław
-    "tcp://[2a05:9403::8b]:7743" # Praha
-  ];
+  services.yggdrasil.config =
+    (with builtins; fromJSON (readFile /var/lib/yggdrasil/keys)) // {
+      Peers = [
+        "tcp://[2a03:3b40:fe:ab::1]:46370" # Praha
+        "tcp://ygg.thingylabs.io:443" # Nürnberg
+        "tcp://176.223.130.120:22632" # Wrocław
+        "tcp://[2a05:9403::8b]:7743" # Praha
+      ];
+    };
 
   nixpkgs.config.allowUnfree = true;
 
diff --git a/lib/yggdrasil.nix b/lib/yggdrasil.nix
index fbfaf362..8897294d 100644
--- a/lib/yggdrasil.nix
+++ b/lib/yggdrasil.nix
@@ -9,6 +9,7 @@
   services.yggdrasil = {
     enable = true;
     package = (import <nixpkgs-unstable> {}).yggdrasil;
+    openMulticastPort = true;
     config.NodeInfo = {
       name = config.networking.hostName + ".c3d2";
       location = "Dresden";