diff --git a/xCAT-client/bin/pping b/xCAT-client/bin/pping
index c928d529b..f38e3f023 100755
--- a/xCAT-client/bin/pping
+++ b/xCAT-client/bin/pping
@@ -142,7 +142,7 @@ sub nmap_pping {
     foreach (@$nodes) {
         $deadnodes{$_}=1;
     }
-    open (FPING, "nmap -PE --send-ip -sP ".join(' ',@$nodes). " 2> /dev/null|") or die("Cannot open nmap pipe: $!");
+    open (FPING, "nmap -PE --system-dns --send-ip -sP ".join(' ',@$nodes). " 2> /dev/null|") or die("Cannot open nmap pipe: $!");
     my $node;
     while (<FPING>) {
       if (/Host (.*) \(.*\) appears to be up/) {