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Re: [K12OSN] LTSP Setup question.



Hello Samps,

Oh man - this is a gem for me, although I'm now asking for some clarification. I'm the teacher who is running one mixed network of K12LTSP (80 boxes) with an NT domain and now a 2k or 2003 server for administrators all on a new fibre backboned network - suggested last spring, by many on this list (to overcome all of the 600 volt power issues in the ceilings of my no-conduit-toss-the-cat5-anywhere-up-there-in-the-ceiling-it'll-be-fine-kind-of-school). My technicians are way to busy to experiment on a working system and come to me for "the plan". I'm a KISS (keep-it-simple-stupid!) kind of person and have said that to avoid DHCP hang ups, I wanted only one dhcp server on my network and it would be the k12 server. This way my thin client will be the only boxes using dhcp, period - no problems. All other boxes are static IP. With a reference to one sheet of paper (my ip number list) I can ssh or vnc into any local linux or win box for maintenance - no "I wonder what the ip of that dhcp driven box is?"

I'm not too sure what the overall benefit would be to running dhcp for the administrator-vp-secretary-councelling win boxes is. My school won't have more than 254 boxes total in it for some time (years). I guess that what we would gain though is better access for notebooks (gota keep the travelling big-wigs happy) or maybe a dhcp wireless access.

Come to think about it, this would be great... When my kids come in for a week-end lan party, they wouldn't have to reset their networks either.

OK, so if my current set up is a 192.168.1.x system, and I wanted to move all of the win boxes to dhcp, what would I need to do using the map that Samps has given below?

All I would need is for a 192.168.1.x/21 network
one win dhcp server 192.168.0.1 - 192.168.1.255
one k12 dhcp server 192.168.2.0- 192.168.3.255
one wireless router gateway 192.168.4.0 - 192.168.5.255 (for notebook access)


I know that I've set up my current dhcp server at 192.168.1.0/24

The /21 is what is different.

How will the three systems acces my one IPCop gateway/firewall out of the building??

I'm excited to give this a go!

Thanks for any advice, Jim

<snip>
Terrell Prudé, Jr. wrote:


You're very lucky indeed, unless you're running your K12LTSP servers in the "standard" 2-NIC architecture. Having eight DHCP servers serving the same broadcast domain can be very, very dangerous. Yes, I know some

snip




--TP _____________________



When running the domain in a private IP block (10.255 and 192.168) you can run as many DHCP servers as you can make subnets.

an example:


A network, 10.255.0.1/255.255.248.0, has 2046 usable addresses, from 10.255.0.1 to 10.255.7.254 (255 is broadcast and can't be allocated for other use.

Each of four DHCP servers are set up to use 10.255.0.1/21 as RANGE and
DHCP server 1 is using a SCOPE of 10.255.0.1 to 10.255.1.255
DHCP server 2 is using a SCOPE of 10.255.2.0 to 10.255.3.255
DHCP server 3 is using a SCOPE of 10.255.4.1 to 10.255.5.255
DHCP server 4 is using a SCOPE of 10.255.6.0 to 10.255.7.255

No overlaps in the scopes ensures that there won't be address-clashes on
the network.

If you subnet using a further 1 bit, then you can have twice as many
DHCP servers, each serving half as many clients.


cheers


Samps



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