why not just continue to get dhcp addresses from the main dhcp machine, but set the nbdroot=your.ltsp.server:port in the pxe.linux.cfg/default file. I do this when u cant control the dhcp server, and it works ok... the only issue might be DNS, but in theory, if the XP machines are getting DNS via dhcp, u should be able to as well. kind regards, David Van Assche <div class="gmail_quote">On Wed, Apr 7, 2010 at 7:19 PM, Sameer Verma <<a href="mailto:sverma@sfsu.edu">sverma@sfsu.edu</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> So, our campus IP folks came by over the Spring break and "upgraded" our network and broke the LTSP lab setup completely. We cannot run our own DHCP server and serve private IPs anymore. Each client, which is a full XP machine is connected to the campus network and must get its IP from the campus DHCP server (totally off limits for us). So, we are going to switch over to proxy DHCP using dnsmasq. <a href="https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP" target="_blank">https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP</a> The lab has 33 machines connected to a switch. The LTSP server (eth0=public IP) is also connected to this switch. How do I restrict pxeboot of the 33 machines from LTSP and not to everyone else in the bldg? Note that as per the instructions at <a href="https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP" target="_blank">https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP</a> we've removed dhcp and installed dnsmasq. We have a list of MAC addresses for all 33 machines. Where do these get specified? Any help would be much appreciated. I've looked into the dhcp-ignore=#known option, but no luck as yet. Is anybody using dnsmasq? cheers, Sameer -- Dr. Sameer Verma, Ph.D. Associate Professor, Information Systems Director, Campus Business Solutions San Francisco State University <a href="http://verma.sfsu.edu/" target="_blank">http://verma.sfsu.edu/</a> <a href="http://cbs.sfsu.edu/" target="_blank">http://cbs.sfsu.edu/</a> <a href="http://is.sfsu.edu/" target="_blank">http://is.sfsu.edu/</a> -- edubuntu-devel mailing list <a href="mailto:edubuntu-devel@lists.ubuntu.com">edubuntu-devel@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/edubuntu-devel" target="_blank">https://lists.ubuntu.com/mailman/listinfo/edubuntu-devel</a> </blockquote></div>