diff --git a/OffloadingDemo/mobile/src/main/java/edu/ucsb/cs/sandlab/offloadingdemo/MainActivity.java b/OffloadingDemo/mobile/src/main/java/edu/ucsb/cs/sandlab/offloadingdemo/MainActivity.java
index 510de80..d99f16d 100755
--- a/OffloadingDemo/mobile/src/main/java/edu/ucsb/cs/sandlab/offloadingdemo/MainActivity.java
+++ b/OffloadingDemo/mobile/src/main/java/edu/ucsb/cs/sandlab/offloadingdemo/MainActivity.java
@@ -206,7 +206,7 @@ class MainActivity extends Activity {
         EditText edit_remote_mac = (EditText) findViewById(R.id.remote_mac);
         String string_remote_ip = edit_remote_ip.getText().toString();
         String string_remote_mac = edit_remote_mac.getText().toString();
-        // check if ip is in valid format and reachable
+        // check if ip is in valid format
         if (Utilities.validIP(string_remote_ip)) {
             remoteIP = string_remote_ip;
         } else {
diff --git a/OffloadingDemo/mobile/src/main/java/edu/ucsb/cs/sandlab/offloadingdemo/Utilities.java b/OffloadingDemo/mobile/src/main/java/edu/ucsb/cs/sandlab/offloadingdemo/Utilities.java
index bcab4f5..37315ce 100755
--- a/OffloadingDemo/mobile/src/main/java/edu/ucsb/cs/sandlab/offloadingdemo/Utilities.java
+++ b/OffloadingDemo/mobile/src/main/java/edu/ucsb/cs/sandlab/offloadingdemo/Utilities.java
@@ -575,13 +575,7 @@ class Utilities {
             i = Integer.parseInt(s);
             if ((i < 0) || (i > 255)) return false;
         }
-        if (ip.endsWith(".")) return false;
-        // ping the ip and see if it is reachable
-        try {
-            return InetAddress.getByName(ip).isReachable(5);
-        } catch (IOException ignored) {
-            return false;
-        }
+        return !ip.endsWith(".");
     }
 
     /**
@@ -592,7 +586,7 @@ class Utilities {
     static boolean validMAC(String mac) {
         // use regular expression to validate a mac address
         // the only valid format is xx:xx:xx:xx:xx:xx
-        Pattern p = Pattern.compile("^([a-fA-F0-9][:]){5}[a-fA-F0-9][:]$");
+        Pattern p = Pattern.compile("/^([a-fA-F0-9]{2}:){5}[a-fA-F0-9]{2}$/");
         Matcher m = p.matcher(mac);
         return m.find();
     }
diff --git a/OffloadingDemo/mobile/src/main/res/layout/activity_main.xml b/OffloadingDemo/mobile/src/main/res/layout/activity_main.xml
index 34e11c9..97b8444 100755
--- a/OffloadingDemo/mobile/src/main/res/layout/activity_main.xml
+++ b/OffloadingDemo/mobile/src/main/res/layout/activity_main.xml
@@ -157,7 +157,7 @@
         <ScrollView
             android:layout_width="match_parent"
             android:layout_height="0dp"
-            android:layout_weight="2">
+            android:layout_weight="1.5">
 
             <LinearLayout
                 android:layout_width="match_parent"