diff --git a/xCAT-server/lib/xcat/plugins/anaconda.pm b/xCAT-server/lib/xcat/plugins/anaconda.pm
index 13646de30..1824cbe91 100644
--- a/xCAT-server/lib/xcat/plugins/anaconda.pm
+++ b/xCAT-server/lib/xcat/plugins/anaconda.pm
@@ -28,6 +28,7 @@ use Socket;
 my @cpiopid;
 
 my %distnames = (
+                 "1310229985.226287" => "centos6",
                  "1176234647.982657" => "centos5",
                  "1156364963.862322" => "centos4.4",
                  "1178480581.024704" => "centos4.5",
diff --git a/xCAT-server/lib/xcat/plugins/ddns.pm b/xCAT-server/lib/xcat/plugins/ddns.pm
index c4c811645..4c86bbea2 100644
--- a/xCAT-server/lib/xcat/plugins/ddns.pm
+++ b/xCAT-server/lib/xcat/plugins/ddns.pm
@@ -924,6 +924,8 @@ sub find_nameserver_for_dns {
        unless (defined $ctx->{nsmap}->{$zone}) { #ok, we already thought about this zone and made a decision
            if ($zone =~ /^\.*192.IN-ADDR.ARPA\.*/ or $zone =~ /^\.*172.IN-ADDR.ARPA\.*/ or $zone =~ /127.IN-ADDR.ARPA\.*/ or $zone =~ /^\.*IN-ADDR.ARPA\.*/ or $zone =~ /^\.*ARPA\.*/) {
                 $ctx->{nsmap}->{$zone} = 0; #ignore zones that are likely to appear, but probably not ours
+	   } elsif ($::XCATSITEVALS{ddnsserver}) {
+                $ctx->{nsmap}->{$zone} = $::XCATSITEVALS{ddnsserver};
            } else {
                my $reply = $ctx->{resolver}->query($zone,'NS');
                if ($reply)  {