diff --git a/xCAT-server/lib/xcat/plugins/nodestat.pm b/xCAT-server/lib/xcat/plugins/nodestat.pm
index 5698eff99..2e59b29ed 100644
--- a/xCAT-server/lib/xcat/plugins/nodestat.pm
+++ b/xCAT-server/lib/xcat/plugins/nodestat.pm
@@ -635,9 +635,9 @@ sub process_request_nmap {
    my @nodesetnodes=();
    foreach my $ip6 (0,1) { #first pass, ipv4, second pass ipv6
    if ($ip6 and scalar(@ip6s)) {
-   open($fping,"nmap -6 -PS --send-ip -p $ports,3001 ".join(' ',@ip6s). " 2> /dev/null|") or die("Can't start nmap: $!");
+   open($fping,"nmap -6 -PS -n --send-ip -p $ports,3001 ".join(' ',@ip6s). " 2> /dev/null|") or die("Can't start nmap: $!");
    } elsif (scalar(@ips)) {
-   open($fping,"nmap -PE --send-ip -p $ports,3001 ".join(' ',@ips). " 2> /dev/null|") or die("Can't start nmap: $!");
+   open($fping,"nmap -PE -n --send-ip -p $ports,3001 ".join(' ',@ips). " 2> /dev/null|") or die("Can't start nmap: $!");
    } else { next; }
    while (<$fping>) {
       if (/Interesting ports on ([^ ]*)[: ]/ or /Nmap scan report for ([^ ]*)/) {