diff --git a/node/ip-poll.js b/node/ip-poll.js
index 5646861..6818a94 100644
--- a/node/ip-poll.js
+++ b/node/ip-poll.js
@@ -10,7 +10,7 @@ var IpPoll = function(switchaddr, hostsaddr) {
 
     var redisClient = redis.createClient();
     var regexp = /\(([0-9]+) hosts* up\)/;
-    var nmap = "nmap -n -sP -T2 ";
+    var nmap = "nmap -n -sP -T4 ";
 
     redisClient.on("connect", function () {
         console.log("connected to redis");