[K12OSN] Re: K12OSN Digest, Vol 24, Issue 14

Henry Burroughs hburroughs at HHPREP.ORG
Tue Feb 14 14:30:23 UTC 2006


I am stuck with an ADS infrastructure (Exchange is entrenched) for the
moment.  I disabled my Windows DHCP server and use one of my Linux
servers for DHCP.  Using Linux DHCP allows you to have if/else
statements within the configuration file, so your server can hand out a
PXE or other type of boot image (ie: using etherboot) automatically
rather than having to specify PXE or etherboot images, and then
overiding specific clients (if you were using Winders DHCP).  I've run
it for at least a year and a half with no problems.

Handing off the servers... depending on the size of the school and if
you do not want to go around manually renewing IP addresses to get
people on the new  Linux DHCP server, you might want to setup an IP pool
on each server that does not overlap (you probably don't want to change
subnets/networks... ick.).  Then you can shut off the Windows DHCP
server and not have to worry about new clients getting the same ip
addresses as systems still on the network... do you follow?  I also set
the lease time to 6 hours right before I did the switch so IP addresses
would refresh pretty quickly (so you could theoretically do it one
evening and have everyone up on the new IPs in the morning by just
switching off the windows dhcp server and starting the new Linux one).
Remember that if you change the lease time, you probably still have
computers out there that just renewed before you changed and still have
the original time (1 day, 2 days, etc).    If you have a router that has
to relay DHCP information, make sure you update that to the new IP
address of the server (I've been splitting into 10.142.*.* networks for
each building.... Linux and Windows 2k/XP systems only... no 98 )

Henry Burroughs
Technology Director
Hilton Head Preparatory School

On Mon, 2006-02-13 at 12:00 -0500, k12osn-request at redhat.com wrote:

> Date: Mon, 13 Feb 2006 09:50:55 -0500
> From: "David Trask" <dtrask at vcsvikings.org>
> Subject: Re: [K12OSN] *DHCP Questions*
> To: vangundypw at sau14.k12.nh.us
> Cc: k12osn at redhat.com
> Message-ID:
>         <fc.004c57de001f05a03b9aca00a4c2a73c.1f05e1 at vcsvikings.org>
> Content-Type: text/plain; charset=ISO-8859-1
> 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
> server and not the K12LTSP server....you can simply blow away the
> 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
> wrote:
> >All,
> >
> >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.
> >
> >-Paul
> David N. Trask
> Technology Teacher/Director
> Vassalboro Community School
> dtrask at vcsvikings.org
> (207)923-3100

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