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Re: [K12OSN] LTSP Expansion



On Mon, 2 Jun 2003 cwagnon redbugmail k12 ar us wrote:

>I have to get some advice from you guys...but before I do I must let you
>know some more about my current setup.
>
>We're running 60 thinknic terminals (3 per classroom) in our elementary
>building. These run from our Terminal Server in our Tech Office (in the
>High School). We run HP Procurve 4000 switches everywhere in this district
>and each building averages 2. The terminals go back to a vlan setup on one
>of the elementary building's switches and then from that switch they go
>via a fiber pair back to our tech office to a vlan on one of our switches
>and then to our server.

We have a bunch of Procurve 4000's as well. By modern standards they are
a bit slow, but they are rock-sold work-horses. 

Since these are modular switches, we'll need to know if you are 
running them on 100mb or 1000mb in this specific case. In either case,
we'll need to know the current utilization of the connection between this
middle school and the high school.


>We're adding onto our elementary 20 more classrooms to accomodate our
>grammar school (k-3). We're getting another server and more terminals
>(probably 60 more). The main problem here is I only have that one pair of
>fiber I can use to go back to the building. There won't be an acceptable
>place in that building that I can store that server. SO...I'll probably be
>ordering a rackmount dell server and adding it to that same
>vlan....somehow. My question is: How's the best way to go about doing
>this? Is there a way I could just run DHCP on my current server and
>somehow have it point the other clients to the other server? Is there a
>better way?

If you have two vlans on the same fiber, will *need* two different 
DHCP settings (either two different DHCP servers or two different subnet
configurations on one server; it's easy either way). Since you will need
two different DHCP settings, it is easy to point one to LTSP server A and
the other to LTSP server B... such as.... (sample config on one DHCP server)

shared-network WORKSTATIONS-A {
  subnet 10.0.1.0 netmask 255.255.255.0 {
     range dynamic-bootp 10.0.1.100 10.0.1.250;
     option routers                10.0.1.254;
     option domain-name-servers    10.0.1.254;
     option domain-name            "ltsp";
     option root-path              "10.0.1.254:/opt/ltsp/i386";
     # trick from Peter Rundle <peter rundle au interpath net>
     if substring (option vendor-class-identifier, 0, 9) = "PXEClient"
     {
        filename      "/lts/pxe/pxelinux.bin";
          # NOTE: kernels are specified in /tftpboot/lts/pxe/pxelinux.cfg/
     }
     else
     {
        filename    "/lts/vmlinuz-2.4.18-ltsp";
     }
  }
}
shared-network WORKSTATIONS-B {
  subnet 10.0.2.0 netmask 255.255.255.0 {
     range dynamic-bootp 10.0.2.100 10.0.2.250;
     option routers                10.0.2.1;
     option domain-name-servers    10.0.2.254;
     option domain-name            "ltsp";
     option root-path              "10.0.2.254:/opt/ltsp/i386";
     # trick from Peter Rundle <peter rundle au interpath net>
     if substring (option vendor-class-identifier, 0, 9) = "PXEClient"
     {
        filename      "/lts/pxe/pxelinux.bin";
          # NOTE: kernels are specified in /tftpboot/lts/pxe/pxelinux.cfg/
     }
     else
     {
        filename    "/lts/vmlinuz-2.4.18-ltsp";
     }
  }
}

-Eric




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