Hi, thank you very much for your input!  Are there some good documents on this 
topic that I can read?  (I've looked at man dhcpd.conf.)

So where do I put the options 66 and 67 and IP address, and what is the correct 
syntax?  Below are the contents of the  /etc/ltsp/ltsp-server.conf and 
/etc/ltsp/dhcpd.conf.

After making the necessary changes, how do I activate the LTSP server to use 
the new information?  Are there some daemons that have to be started?  How do 
you start/stop the LTSP server?

[root@localhost2 ltsp]# chkconfig --list dhcpd
dhcpd           0:off   1:off   2:off   3:off   4:off   5:off   6:off

[root@localhost2 ltsp]# ps -ef |grep -i dhcpd
[root@localhost2 ltsp]#


BTW, here is a more correct diagram than the one from a previous email.

laptop <----> LAN <-----> Windows Servers and LTSP Server

The laptop running windows boots up with DHCP IP the usual way.  It obtains 
DHCP IP address, Gateway, DNS, ADS, Webservers, etc. from the usual windows 
environment.  Somewhere in that LAN is the LTSP Server running CentOS.

Task:  Launch the Oracle VirtualBox from the laptop to download a CentOS 6.4 
GUI desktop environment running inside the VirtualBox.

Do the laptop and LTSP Server have to be in the same subnet?

   *************************

[root@localhost2 ltsp]# pwd
/etc/ltsp

[root@localhost2 ltsp]# cat dhcpd.conf
#
# Default LTSP dhcpd.conf config file.
#
ddns-update-style interim;
ignore client-updates;
allow booting;
allow bootp;

option option-128 code 128 = string;
option option-129 code 129 = string;

use-host-decl-names on;

next-server 192.168.67.1;

authoritative;

subnet 192.168.67.0 netmask 255.255.255.0 {
    range 192.168.67.20 192.168.67.250;
    option domain-name "ltsp";
    option domain-name-servers 192.168.67.1;
    option broadcast-address 192.168.67.255;
    option routers 192.168.67.1;
    get-lease-hostnames true;
    option subnet-mask 255.255.255.0;
    option root-path "nfs:/opt/ltsp/i386";
# Use this root-path line instead for NBD clients. Dont forget to run
# ltsp-update-image!
#    option root-path "nbd:192.168.67.1:2000:squashfs:ro";
    if substring( option vendor-class-identifier, 0, 9 ) = "PXEClient" {
        filename "/ltsp/i386/pxelinux.0";
    } else {
        filename "/ltsp/i386/nbi.img";
    }

}

   ********************

[root@localhost2 ltsp]# cat ltsp-server.conf

# /etc/ltsp/ltsp-server.conf
# Contains variables which are shared by ltsp-tools.
#VENDORDEF="Fedora"
#RELEASEDEF=18

VENDORDEF="RHEL"
RELEASEDEF=el6

# The LTSP base directory. Defaults to "/opt/ltsp".
#BASE="/opt/ltsp"
BASE="/opt/ltsp"

# Space-separated list of TFTP directories to update kernels and initrd's to.
# Defaults to "/var/lib/tftpboot /tftpboot /srv/tftp".
TFTP_DIRS="/var/lib/tftpboot"

# The LTSP subdirectory within the TFTP base directory.
# Defaults to "ltsp".
#TFTP_BOOT_DIR="students"
TFTP_BOOT_DIR="ltsp"

# The default network device that the server will be using for ltsp-dhcpd.
###LTSP_DEV=eth1
LTSP_DEV=eth0
# Changes this to the IP address of the server
LTSP_DEFAULTIP="192.168.10.155"

   ***********


--------------------------------------------
On Wed, 6/26/13, Christian Lensch <len...@opensourcemedia.de> wrote:

 Subject: Re: [Ltsp-discuss] Fw: Re: ltsp-build-client failed after 78% 
completion
 To: ltsp-discuss@lists.sourceforge.net
 Date: Wednesday, June 26, 2013, 10:12 PM
 
 Sorry, I forgot to add that in this
 scenario you must not run a
 dhcp-service on the ltsp-server.
 
 Am 27.06.2013 07:09, schrieb Christian Lensch:
 > Hi Km,
 > 
 > configure the dhcp-server with option 66 and 67 (I
 think its called
 > boot-server and boot-image) where 66 must contain the
 IP (maybe  the
 > dns-name) of your LTSP-Server and 67 the path to your
 image on the
 > ltsp-server.
 > 
 > Configure virtual-box to use bridged networking for the
 client.
 > 
 > That should do the trick.
 > 
 > Am 26.06.2013 21:24, schrieb Km -:
 >>
 >> Hi, this is a summary of the previous message in a
 shorter form.  The scenario is:
 >>
 >> DHCP-Windows-Server <---> Laptop with
 VirtualBox <---> LTSP CentOS Server
 >>
 >>
 >> 1) Laptop (running MS windows) boots up under the
 usual LAN environment settings using DHCP.
 >>
 >> 2) Launch the Oracle VirtualBox from the laptop.
 >>
 >> 3) Launch CentOS thin client inside the VirtualBox
 and use the CentOS image downloaded from the LTSP server
 (LTSP server has only one NIC card).  This provides a
 complete Xwindows/GUI CentOS desktop environment running
 inside the Oracle VirtualBox.
 >>
 >> How to configure the VirtualBox on the laptop and
 the LTSP server so that step (3) is feasible?  Any
 possibilities of the LTSP server interfering with the
 DHCP-Windows-Server?
 >>
 >> Some relevant URLs:
 >>
 >> http://www.thefanclub.co.za/how-to/how-create-virtualbox-ubuntu-ltsp-thin-client
 >>
 >> https://fedorahosted.org/k12linux/wiki/MixedNetworkSetup
 >>
 >> Thank you for your input!
 >>
 >>
 >> --------------------------------------------
 >> On Wed, 6/26/13, Km - <km3...@yahoo.com>
 wrote:
 >>
 >>  Subject: Re: [Ltsp-discuss] Fw: Re:
 ltsp-build-client failed after 78% completion
 >>  To: ltsp-discuss@lists.sourceforge.net
 >>  Date: Wednesday, June 26, 2013, 9:42 AM
 >>  
 >>  Hi, here is the progress report for
 >>  the experts, and thank you for your
 pointers.
 >>  
 >>  Since the LTSP server uses only one physical
 NIC card, eth0,
 >>  which has a DHCP IP address of
 192.168.10.155, I ventured
 >>  and set the following in the
 /etc/ltsp/ltsp-server.conf
 >>  file:
 >>  
 >>  BASE="/opt/ltsp"    <=== this is
 the default
 >>  setup
 >>  
 >>  TFTP_BOOT_DIR="ltsp"   <===
 this is
 >>  default
 >>  
 >>  LTSP_DEV=eth0 
    <===  changed
 >>  from default eth1 to eth0 (NIC card of LTSP
 server using
 >>  DHCP)
 >>  
 >>  LTSP_DEFAULTIP="192.168.10.155"   
 <=== 
 >>  DHCP IP address of eth0  (netmask is
 255.255.255.0)
 >>  
 >>  
 >>  I then ran the command
 >>  
 >>     ltsp-build-client --release
 epel-6-x86_64
 >>  --debug --noprogress
 >>  
 >>  The installation completed this time. 
 But it still
 >>  displayed the error during the installation:
 >>  
 >> 
 /usr/share/ltsp/plugins/ltsp-build-client/RHEL/009-mock-chroot:
 >>  line 83: 
 >>  /opt/ltsp/x86_64/etc/sysconfig/firsboot:No
 such file or
 >>  directory
 >>  
 >>  (BTW, I also looked at
 >>  
 >>  
 >>http://www.thefanclub.co.za/how-to/how-create-virtualbox-ubuntu-ltsp-thin-client
 >>  
 >>  but this only talks about the Oracle
 VirtualBox, but not how
 >>  to install and configure LTSP on the CentOS
 6.x side to make
 >>  it work.  Can someone please provide
 some
 >>  pointers?  I can copy+paste various
 config files here
 >>  if needed.)
 >>  
 >>  I also looked at
 >>  
 >>  https://fedorahosted.org/k12linux/wiki/MixedNetworkSetup
 >>  
 >>  Here is the /etc/ltsp/dhcpd.conf file. 
 I imagine I'll
 >>  need to change various values in it. 
 The LTSP server
 >>  running CentOS 6.4 has DHCP address
 192.168.10.155 and the
 >>  client is coming from an Oracle VirtualBox on
 some laptop.
 >>  
 >>  [root@localhost2 ltsp]# ll
 /etc/ltsp/dhcpd.conf
 >>  -rw-r--r--. 1 root root 944 Jun 20 09:28
 >>  /etc/ltsp/dhcpd.conf
 >>  
 >>  [root@localhost2 ltsp]# cat
 /etc/ltsp/dhcpd.conf
 >>  #
 >>  # Default LTSP dhcpd.conf config file.
 >>  #
 >>  ddns-update-style interim;
 >>  ignore client-updates;
 >>  allow booting;
 >>  allow bootp;
 >>  
 >>  option option-128 code 128 = string;
 >>  option option-129 code 129 = string;
 >>  
 >>  use-host-decl-names on;
 >>  
 >>  next-server 192.168.67.1;
 >>  
 >>  authoritative;
 >>  
 >>  subnet 192.168.67.0 netmask 255.255.255.0 {
 >>      range 192.168.67.20
 192.168.67.250;
 >>      option domain-name "ltsp";
 >>      option domain-name-servers
 192.168.67.1;
 >>      option broadcast-address
 192.168.67.255;
 >>      option routers 192.168.67.1;
 >>      get-lease-hostnames true;
 >>      option subnet-mask
 255.255.255.0;
 >>      option root-path
 "nfs:/opt/ltsp/i386";
 >>  # Use this root-path line instead for NBD
 clients. Dont
 >>  forget to run
 >>  # ltsp-update-image!
 >>  #    option root-path
 >>  "nbd:192.168.67.1:2000:squashfs:ro";
 >>      if substring( option
 vendor-class-identifier,
 >>  0, 9 ) = "PXEClient" {
 >>          filename
 >>  "/ltsp/i386/pxelinux.0";
 >>      } else {
 >>          filename
 "/ltsp/i386/nbi.img";
 >>      }
 >>  }
 >>  
 >>  
 >>  FYI, this is the output of the
 ltsp-build-client command
 >>  above:
 >>  
 >>  The client has been installed
 successfully.  Now we
 >>  must update the server to boot the thin
 client image. 
 >>  
 >>  
 >>  After that is complete have a look at
 >>  /var/lib/tftpboot/ltsp/i386/lts.conf and
 verify everything
 >>  is setup the way you want.
 >>  
 >>  [root@localhost2 result]# grep -in error
 root.log
 >>  302:DEBUG
 util.py:264:   libgpg-error 
 >>             
    
 >>    x86_64 1.7-4.el6     
    
 >>         base 
 >>     59 k
 >>  664:DEBUG util.py:264:   
 libgpg-error.x86_64
 >>  0:1.7-4.el6         
    
 >>           
 >>  1072:DEBUG util.py:264: 
 libgpg-error-1.7-4.el6.x86_64
 >>  
 >>  [root@localhost2 result]# grep -in fail
 root.log
 >>  [root@localhost2 result]#
 >>  [root@localhost2 result]# grep -in fatal
 root.log
 >>  [root@localhost2 result]#
 >>  [root@localhost2 result]# grep -in cannot
 root.log
 >>  [root@localhost2 result]#
 >>  [root@localhost2 result]# grep -in unable
 root.log
 >>  [root@localhost2 result]#
 >>  [root@localhost2 result]# grep -in warn
 root.log
 >>  437:DEBUG util.py:264:  warning:
 /etc/hosts created as
 >>  /etc/hosts.rpmnew
 >>  438:DEBUG util.py:264:  warning:
 /etc/yum.conf created
 >>  as /etc/yum.conf.rpmnew
 >>  [root@localhost2 result]#
 >>  [root@localhost2 result]# grep -in 'return
 code' root.log
 >>  56:DEBUG util.py:354:  Child return code
 was: 0
 >>  58:DEBUG util.py:354:  Child return code
 was: 0
 >>  60:DEBUG util.py:354:  Child return code
 was: 0
 >>  ...
 >>  All zero return codes
 >>  
 >>  
 >>  --------------------------------------------
 >>  On Tue, 6/25/13, Km - <km3...@yahoo.com>
 >>  wrote:
 >>  
 >>   Subject: Re: [Ltsp-discuss] Fw:
 Re: ltsp-build-client
 >>  failed after 78% completion
 >>   To: ltsp-discuss@lists.sourceforge.net
 >>   Date: Tuesday, June 25, 2013, 7:13
 AM
 >>   
 >>   Hi all, it would be a great help
 to
 >>   everybody if we can come up with
 some working procedures,
 >>  or
 >>   something that pioneers like us
 can run some tests and
 >>   report back the issues encountered
 so we can figure out
 >>  how
 >>   to proceed or to reach the
 conclusion that the endeavor is
 >>   not feasible.  In the case of
 the Oracle Virtualbox or
 >>   some other similar software, the
 Virtualbox does not have
 >>  a
 >>   physical NIC card, and I am not
 sure if it uses the same
 >>  NIC
 >>   card as the Windows 7 laptop NIC
 card or some other
 >>  virtual,
 >>   non-static IP address NIC with a
 different IP address from
 >>   the laptop NIC card.  Thank
 you for the pointers.
 >>   
 >>   --------------------------------------------
 >>   On Tue, 6/25/13, Radek
 Bursztynowski <ra...@bursztynowski.waw.pl>
 >>   wrote:
 >>   
 >>    Subject: Re: [Ltsp-discuss] Fw: Re:
 >>  ltsp-build-client
 >>   failed after 78% completion
 >>    To: ltsp-discuss@lists.sourceforge.net
 >>    Date: Tuesday, June 25, 2013, 3:12 AM
 >>    
 >>    Good question! I am interested in the
 >>    answer too.
 >>    
 >>    In general in my opinion documentation
 related to
 >>  network
 >>    configuration documentation is not
 clear.
 >>    
 >>    https://fedorahosted.org/k12linux/wiki/NetworkSetup
 >>    
 >>    https://fedorahosted.org/k12linux/wiki/MixedNetworkSetup
 >>    
 >>    I look for network solution in four
 cases:
 >>    
 >>    A. LTSP server is equipped in one NIC,
 and
 >>       (1) physical NIC
 only,
 >>       (2) physical NIC
 configured as a bridge;
 >>    
 >>    B. LTSP server i equipped in two NICs
 >>       (3) with no bridges
 (one NIC dedicated to
 >>    Internet connection, the second one
 destinated to
 >>  LTSP
 >>    privet network),
 >>       (4) with one bridge
 for Internet
 >>    connection and the second NIC for LTSP
 private
 >>  network.
 >>    
 >>    Best regards,
 >>    Radek
 >>    
 >>    ---
 >>    
 >>    Hi, I was tasked to use the Oracle
 Virtualbox running
 >>  on
 >>    windows 7 with LTSP on the server
 side, and download
 >>  the
 >>    CentOS from the LTSP server to the
 Oracle
 >>  Virtualbox. 
 >>    So there will not be a private
 hardwired network with
 >>  just
 >>    the LTSP server and the thin clients
 only.  And we
 >>  can
 >>    assume that the LTSP server has only
 one network
 >>  card,
 >>   which
 >>    for the test environment is currently
 a DHCP IP
 >>  address.
 >>    
 >>    In this case what are the appropriate
 values to use
 >>  for
 >>   the
 >>    two parameters:
 >>    
 >>    LTSP_DEV=
 >>    LTSP_DEFAULT=
 >>    
 >>    Thank you!
 >>    
 >>   
 --------------------------------------------
 >>    On Fri, 6/21/13, Joshua Trimm <ensla...@enslaver.com>
 >>    wrote:
 >>    
 >>     Subject: Re: [Ltsp-discuss]
 Fw: Re:
 >>   ltsp-build-client
 >>    failed after 78% completion
 >>     To: ltsp-discuss@lists.sourceforge.net
 >>     Date: Friday, June 21,
 2013, 7:49 AM
 >>     
 >>     I recommend these steps:
 >>     
 >>     - Clean the yum cache
 >>     # yum clean all
 >>     - Remove any half made and
 non working chroot's along
 >>   with
 >>     mock cache.
 >>     # rm -rf /opt/ltsp/i386
 /opt/ltsp/x86_64
 >>     /opt/ltsp/mock/epel-* 
 >>     /var/cache/mock/epel-*
 >>     - Update LTSP server
 >>     # yum update ltsp-server
 nbd ltspfs ldm ldminfod
 >>     - edit
 /etc/ltsp/ltsp-server.conf and make sure your
 >>     LTSP_DEV and 
 >>     LTSP_DEFAULTIP are correct
 >>     # nano
 /etc/ltsp/ltsp-server.conf
 >>     - Build the client
 >>     # ltsp-build-client --debug
 --noprogress --release
 >>     epel-6-i386
 >>     
 >>     Follow any additional steps
 listed in the
 >>    README.rpminstall
 >>     
 >>     Hope everything goes smooth
 from here on, let me know
 >>   if
 >>    you
 >>     have any 
 >>     other issues.
 >>     
 >>     -Joshua
 >>     
 >>     
 >>    
 >>   
 >> 
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 >> 
 _____________________________________________________________________
 >>    Ltsp-discuss mailing
 list.   To un-subscribe,
 >>    or change prefs, goto:
 >>          https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
 >>    For additional LTSP
 help,   try #ltsp channel
 >>    on irc.freenode.net
 >>    
 >>   
 >> 
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 >>    This SF.net email is sponsored by
 Windows:
 >>    
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 >> 
 _____________________________________________________________________
 >>    Ltsp-discuss mailing
 list.   To un-subscribe,
 >>    or change prefs, goto:
 >>          https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
 >>    For additional LTSP
 help,   try #ltsp channel
 >>    on irc.freenode.net
 >>    
 >>   
 >>   
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 >>   _____________________________________________________________________
 >>   Ltsp-discuss mailing
 list.   To un-subscribe,
 >>   or change prefs, goto:
 >>         https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
 >>   For additional LTSP
 help,   try #ltsp channel
 >>   on irc.freenode.net
 >>   
 >>  
 >> 
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 _____________________________________________________________________
 >>  Ltsp-discuss mailing
 list.   To un-subscribe,
 >>  or change prefs, goto:
 >>        https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
 >>  For additional LTSP
 help,   try #ltsp channel
 >>  on irc.freenode.net
 >>
 >>
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 _____________________________________________________________________
 >> Ltsp-discuss mailing list.   To
 un-subscribe, or change prefs, goto:
 >>       https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
 >> For additional LTSP help,   try
 #ltsp channel on irc.freenode.net
 >>
 > 
 
 
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 or change prefs, goto:
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