[K12OSN] *DHCP Questions*

David Trask dtrask at vcsvikings.org
Mon Feb 13 14:50:55 UTC 2006

Couple of questions for you....

Not ever having used Windows ADS....does ADS depend in any way on Windows
DHCP?  If not, then it might be best for you to use the K12LTSP DHCP.  Is
the K12LTSP server on the same subnet as all the Windows machines? 
OR....does it have two NICs and the terminals sit on their own network.  

Now....we'll assume that the K12LTSP server shares the same network as
everything else.  If that's the case and ADS doesn't need Windows
DHCP....then simply turn off the DHCP on the Windows side and use the
K12LTSP DHCP.  You'll need to make sure the K12LTSP server is handing out
the correct addresses and subnet for your network.  This is most easily
done during installation .  It's possible to change on the fly, but may
not be worth the headache.  If the users home directories live on the ADS
server and not the K12LTSP server....you can simply blow away the K12LTSP
server (back up a few configs like icewm if you use it)...and then
re-install...this time entering the correct info along the way.  It is
possible to change mid-stream....perhaps someone on the list can point you
to all the files that need to change...or maybe Eric's K12LTSP-initialize
script will do it....haven't looked.  

Assuming you'll need to add static entries for things like servers and
printers....this is easy to do....just look in dhcpd.conf for
examples....or you can use Webmin to add them graphically.  Once you add
all the static (reserved) entries...make a backup of it so you can use it
another time....I cut and paste from mine year to year....I've been using
Linux DHCP servers for years.

vangundypw at sau14.k12.nh.us on Monday, February 13, 2006 at 8:36 AM +0000
>I have a DHCP question because I think I am making thinks more confusing
>for myself than they should be. I will tell you what our current setup
>is and then what I would like. 
>Our current setup is a Windows ADS domain with a Windows DHCP server
>handing out leases. We also have a K12LTSP server authenticating against
>the Windows ADS so that users can have the same sign on for the
>terminals as they do the Windows boxes. Here's the issue though, we have
>both K12LTSP and Windows DHCP server on the same network so both are
>handing out leases. Computers that get leases from the K12LTSP server
>aren't working. Now we come to my question...
>How can I get K12LTSP to point to the Windows DHCP server unless it is a
>client booting via bootp or pxe and vice versa (Windows DHCP server
>point to K12LTSP when it is a bootp or pxe request)? On the other hand,
>is it possible to have K12LTSP do all DHCP for the network and if so how
>would the DHCP conf file look? Any and all help would be greatly
>appreciated. Thanks.

David N. Trask
Technology Teacher/Director
Vassalboro Community School
dtrask at vcsvikings.org

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