[K12OSN] DHCP and PXE with two different Class of IP address

[Bert Rolston]

Hi John,

Thanks for your reply.

The reason they went to a Class B scheme was to overcome the 254 host
limit. 

They are using a /16 subnet mask.

The network in question is at a small tertiary educational
establishment. It provides courses in business studies ( 1 lab),
animation ( 2 labs), certificate in television production, christian
ministry and counselling courses. Also running on the same network are
campus admin, a small regional TV station, TV production and marketing
company, an animation studio with render farm.

Thanks for your time,
Bert

On Thu, 2006-12-07 at 12:54 -0400, John Lucas wrote:
> You mentioned that the current network is using a class B address scheme, but 
> is that address space sub-divided? What netmask is being used?
> 
> Almost no one with a class B uses the 16-bit netmask; use of a 24-bit netmask 
> divides the single network into up, to 254 subnets of up to 254 hosts each (a 
> more useful scheme). Assuming that a 24-bit (or larger) netmask *is* being 
> used, how about creating a new private (class-C sized) subnet on one NIC in 
> an LTSP server, and have another NIC attached to the existing network? This 
> allows the terminals to use DHCP/tftp/PXE/etherboot from the LTSP server and 
> still access the MS Terminal server (using rdesktop) without changing the 
> existing network (save for the addition of the new LTSP server and it's 
> terminals). In this scenario the LTSP server could be used as a router (for 
> terminals running rdesktop sessions), or as a dual-homed host (running 
> rdesktop from the LTSP server itself).
> 
> My choice would be to run rdesktop on the terminal (via the SCREEN_x directive 
> in lts.conf). This allows sound to be re-directed from the MS TC to the 
> terminal and preseves the ability to run Linux on the LTSP server (via a 
> separate SCREEN_x directive). Thin clients are far simpler to maintain than 
> stand-alone PCs. 
> 
> 
> On Thursday 07 December 2006 00:58, you wrote:
> > Hey folks,
> >
> > I know this little chestnut has been chewed over many times on this
> > list. I don't remember my situation coming up. So first I'll describe
> > the environment.
> >
> > =======================
> > The current environment
> > =======================
> >
> > An MS Network with AD, terminal server and MS DHCP server with CLASS B
> > IP address scheme.
> >
> > They want to revitalise their old Win 9x / NT machines and are
> > investigating using K12LTSP or locally installed Linux. They have a lot
> > of old classic to PII Pentiums which are gathering dust.
> >
> > One option is to boot the LTSP terminals in kiosk mode to access their
> > Windows Terminal server using the RDP client included.
> >
> > The other option is to install a lightweight Linux distro (Puppy or DSL)
> > on all the machines and use the RDP client that way.
> >
> > They don't want to change their existing infrastructure if at all
> > possible. Even making changes to their DHCP server is considered risky
> > by the network admin. ANY adverse impact on their existing system is
> > unacceptable.
> >
> > The network admin uses Ubuntu at home, but has been unable to get any
> > Linux computer to authenticate to the AD at work.
> > For that reason he only sees limited potential for Linux / OSS in their
> > current environment.
> >
> > Users will authenticate to their AD through Windows terminal sessions.
> >
> > Later on they may enable access to the Linux desktop and apps.
> >
> >
> > =======================
> > My Question
> > =======================
> >
> > Given that the current DHCP server issues Class B addresses.
> >
> > Can the K12LTSP DHCP server, which issues Class C addresses
> > 	- co-exist on the same physical media
> > 	- handle PXE requests from the old hardware,
> > 	- and not interfere with their current setup?
> >
> > If so what changes (if any) need to be made
> > 	- on the MS DHCP server,
> > 	- their current setup
> > 	- the K12LTSP server
> >
> > Thanks,
> > Bert
> >
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