diff --git a/mtu_discover.sh b/mtu_discover.sh
index 58d3944..25f9870 100755
--- a/mtu_discover.sh
+++ b/mtu_discover.sh
@@ -9,6 +9,8 @@ then
   HOST=$1
 fi
 
+ping $HOST -c 5 || exit 2
+
 for (( i=1472; i>100; i-- ))
 do
   ping $HOST -M do -s $i -O -c 1 -W 0.3 && break