diff --git a/xCAT-server/lib/xcat/plugins/bmcconfig.pm b/xCAT-server/lib/xcat/plugins/bmcconfig.pm
index 9dd82eefd..62b6bbdd4 100644
--- a/xCAT-server/lib/xcat/plugins/bmcconfig.pm
+++ b/xCAT-server/lib/xcat/plugins/bmcconfig.pm
@@ -43,7 +43,7 @@ sub net_parms {
     my $ipnum = ($1<<24)+($2<<16)+($3<<8)+$4;
     $mask =~ /([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/;
     my $masknum = ($1<<24)+($2<<16)+($3<<8)+$4;
-    $net =~ /([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/;
+    $net =~ /([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/ or next; #next if ipv6, TODO: IPv6 support
     my $netnum = ($1<<24)+($2<<16)+($3<<8)+$4;
     if ($gw eq '<xcatmaster>') {
 	$gw=xCAT::Utils->my_ip_facing($ip);