diff --git a/perl-xCAT-2.0/xCAT/Utils.pm b/perl-xCAT-2.0/xCAT/Utils.pm
index 50adb12bf..ece8c90b7 100644
--- a/perl-xCAT-2.0/xCAT/Utils.pm
+++ b/perl-xCAT-2.0/xCAT/Utils.pm
@@ -2,6 +2,7 @@
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 package xCAT::Utils;
 use xCAT::Table;
+use POSIX qw(ceil);
 use Socket;
 use xCAT::Schema;
 use Data::Dumper;
@@ -995,6 +996,34 @@ sub isServiceNode
     }
 }
 
+sub my_hexnets
+{
+   my $rethash;
+    my @nets = split /\n/, `/sbin/ip addr`;
+    foreach (@nets)
+    {
+        my @elems = split /\s+/;
+        unless (/^\s*inet\s/)
+        {
+            next;
+        }
+        (my $curnet, my $maskbits) = split /\//, $elems[2];
+        my $bitstoeven = (4-($maskbits%4));
+        if ($bitstoeven eq 4) { $bitstoeven = 0; }
+        my $padbits = (32-($bitstoeven+$maskbits));
+        my $numchars = int(($maskbits + $bitstoeven)/4);
+        my $curmask = 2**$maskbits - 1 << (32 - $maskbits);
+        my $nown = unpack("N", inet_aton($curnet));
+        $nown = $nown & $curmask;
+        my $highn = $nown+((2**$bitstoeven-1)<<(32-$maskbits-$bitstoeven));
+        while ($nown <= $highn) {
+           my $nowhex = sprintf("%08x",$nown);
+           $rethash->{substr($nowhex,0,$numchars)} = $curnet;
+           $nown += 1<<(32-$maskbits-$bitstoeven);
+        }
+    }
+    return $rethash;
+}
 #-------------------------------------------------------------------------------
 
 =head3   my_ip_facing    
diff --git a/xCAT-server-2.0/lib/xcat/plugins/mknb.pm b/xCAT-server-2.0/lib/xcat/plugins/mknb.pm
new file mode 100644
index 000000000..ee9c02be6
--- /dev/null
+++ b/xCAT-server-2.0/lib/xcat/plugins/mknb.pm
@@ -0,0 +1,119 @@
+package xCAT_plugin::mknb;
+use File::Temp qw(tempdir);
+use xCAT::Utils;
+use File::Path;
+use File::Copy;
+use Data::Dumper;
+
+sub handled_commands {
+   return { 
+      mknb => 'mknb',
+   };
+}
+
+sub process_request {
+   my $request = shift;
+   my $callback = shift;
+   my $sitetab = xCAT::Table->new('site');
+   my $serialport;
+   my $serialspeed;
+   my $serialflow;
+   my $xcatdport = 3001;
+   if ($sitetab) {
+      my $portent = $sitetab->getAttribs({key=>'defserialport'});
+      if ($portent and defined($portent->{value})) {
+         $serialport=$portent->{value};
+      }
+      $portent = $sitetab->getAttribs({key=>'defserialspeed'});
+      if ($portent and defined($portent->{value})) {
+         $serialspeed=$portent->{value};
+      }
+      $portent = $sitetab->getAttribs({key=>'defserialflow'});
+      if ($portent and defined($portent->{value})) {
+         $serialflow=$portent->{value};
+      }
+      $portent = $sitetab->getAttribs({key=>'xcatdport'});
+      if ($portent and defined($portent->{value})) {
+         $xcatdport=$portent->{value};
+      }
+      $sitetab->close;
+   }
+
+   my $installdir = "/install";
+   my $tftpdir = "/tftpboot";
+   if (scalar(@{$request->{arg}}) != 1) {
+      $callback->({error=>Dumper($request)." Need to specifiy architecture (x86_64 or ppc64)"},{errorcode=>[1]});
+      return;
+   }
+   my $arch = $request->{arg}->[0];
+   unless (-d "$::XCATROOT/share/xcat/netboot/$arch") {
+      $callback->({error=>"Unable to find directory $::XCATROOT/share/xcat/netboot/$arch",errorcode=>[1]});
+      return;
+   }
+   unless ( -r "/root/.ssh/id_rsa.pub" ) {
+      $callback->({data=>["Generating ssh private key for root"]});
+      my $rc=system('ssh-keygen -t rsa -q -b 2048 -N "" -f  /root/.ssh/id_rsa');
+      if ($rc) {
+         $callback->({error=>["Failure executing ssh-keygen for root"],errorcode=>[1]});
+      }
+   }
+   my $tempdir = tempdir("mknb.$$.XXXXXX",TMPDIR=>1);
+   unless ($tempdir) {
+      $callback->({error=>["Failed to create a temporary directory"],errorcode=>[1]});
+      return;
+   }
+   my $rc = system("cp -a $::XCATROOT/share/xcat/netboot/$arch/nbroot/* $tempdir");
+   if ($rc) {
+      system("rm -rf $tempdir");
+      $callback->({error=>["Failed to copy  $::XCATROOT/share/xcat/netboot/$arch/nbroot/ contents"],errorcode=>[1]});
+      return;
+   }
+   mkpath($tempdir."/root/.ssh");
+   copy("/root/.ssh/id_rsa.pub","$tempdir/root/.ssh/authorized_keys");
+   if (-r "$installdir/postscripts/hostkeys/ssh_host_key") {
+      copy("$installdir/postscripts/hostkeys/ssh_host_key","$tempdir/etc/ssh_host_key");
+      copy("$installdir/postscripts/hostkeys/ssh_host_rsa_key","$tempdir/etc/ssh_host_rsa_key");
+      copy("$installdir/postscripts/hostkeys/ssh_host_dsa_key","$tempdir/etc/ssh_host_dsa_key");
+   }
+   unless (-r "$tempdir/etc/ssh_host_key") {
+      system("ssh-keygen -t rsa1 -f $tempdir/etc/ssh_host_key -C '' -N ''");
+      system("ssh-keygen -t rsa -f $tempdir/etc/ssh_host_rsa_key -C '' -N ''");
+      system("ssh-keygen -t dsa -f $tempdir/etc/ssh_host_dsa_key -C '' -N ''");
+   }
+   $callback->({data=>["Creating nbfs.$arch.gz in $tftpdir/xcat"]});
+   system("cd $tempdir; find . | cpio -o -H newc | gzip -9 > $tftpdir/xcat/nbfs.$arch.gz");
+   system ("rm -rf $temdir");
+   my $hexnets = xCAT::Utils->my_hexnets();
+   my $consolecmdline;
+   if ($serialport and $serialspeed) {
+       $consolecmdline = "console=ttyS$serialport,$serialspeed";
+      if ($serialflow =~ /cts/ or $serialflow =~ /hard/) {
+         $consolecmdline .= "n8r";
+      } 
+   }
+   my $cfgfile;
+   foreach (keys %{$hexnets}) {
+      if ($arch =~ /x86/) {
+         open($cfgfile,">","$tftpdir/pxelinux.cfg/".uc($_));
+         print $cfgfile "DEFAULT xCAT\n";
+         print $cfgfile "  LABEL xCAT\n";
+         print $cfgfile "  KERNEL xcat/nbk.$arch\n";
+         print $cfgfile "  APPEND initrd=xcat/nbfs.$arch.gz xcatd=".$hexnets->{$_}.":$xcatdport $consolecmdline\n";
+         close($cfgfile);
+      } elsif ($arch =~ /ppc/) {
+         open($cfgfile,">","$tftpdir/etc/".lc($_));
+         print $cfgfile "timeout=5\n";
+         print $cfgfile "label=xcat\n";
+         print $cfgfile "image=xcat/nbk.$arch\n";
+         print $cfgfile "initrd=xcat/nbfs.$arch.gz\n";
+         print $cfgfile 'append="xcatd='.$hexnets->{$_}.":$xcatdport $consolecmdline\n";
+         close($cfgfile);
+      }
+   }
+
+
+   
+
+}
+
+1;