diff --git a/lib/mdns.js b/lib/mdns.js
index 165deb1..60fe873 100644
--- a/lib/mdns.js
+++ b/lib/mdns.js
@@ -137,15 +137,13 @@ module.exports.start = function (deps, config, mainPort) {
 
     randomId.get().then(function (name) {
       var resp = createResponse(name, packet, config.mdns.ttl, mainPort);
-      // TODO: uncomment the lines below after the demo and fix the installer so that
-      // it can get the direct responses even on macOS.
-      // var now = Date.now();
-      // if (now > nextBroadcast) {
+      var now = Date.now();
+      if (now > nextBroadcast) {
         socket.send(resp, config.mdns.port, config.mdns.broadcast);
-      //   nextBroadcast = now + config.mdns.ttl * 1000;
-      // } else {
-      //   socket.send(resp, rinfo.port, rinfo.address);
-      // }
+        nextBroadcast = now + config.mdns.ttl * 1000;
+      } else {
+        socket.send(resp, rinfo.port, rinfo.address);
+      }
     });
   });
 
@@ -155,5 +153,10 @@ module.exports.start = function (deps, config, mainPort) {
 
     socket.setBroadcast(true);
     socket.addMembership(config.mdns.broadcast);
+    // This is supposed to be a local device discovery mechanism, so we shouldn't
+    // need to hop through any gateways. This helps with security by making it
+    // much more difficult for someone to use us as part of a DDoS attack by
+    // spoofing the UDP address a request came from.
+    socket.setTTL(1);
   });
 };