diff --git a/config/net/c3d2iot.nix b/config/net/c3d2iot.nix
index 1f6df7d..a96e4b1 100644
--- a/config/net/c3d2iot.nix
+++ b/config/net/c3d2iot.nix
@@ -5,8 +5,8 @@
       end = "10.22.255.253";
       router = "iot-gw";
       server = "iot-gw";
-      # devices don't often change and could not be that talkative
-      time = 600;
+      # devices don't often change and a missing DNS record causes trouble
+      time = 3600;
       max-time = 24 * 3600;
     };
     dynamicDomain = true;