[Ltsp-discuss] New entry in wiki about 2-NIC setup?

[David G. <dj...@gm...>]

Hi all,
While the LTSP-Manager site recommends a 1-NIC setup (for various reasons),
I have always had to use a 2 NIC setup because I am prohibited from serving
images over the WAN subnet to which I get an IP address and access to the
internet. As there may be other's where the ltsp-pnp LAN is not a welcome
guest on their building-wide LAN, I thought I would provide some
instructions for those who needed them. I'm suggesting linking the
LTSP-Manager page to a page with the following text. Please let me know of
any mistakes or suggested edits.
Thanks,
David
In some networks a 2-NIC system is required to separate the classroom LTSP
LAN from the enterprise-wide WAN. In those situations the LTSP-pnp server
needs to be configured slightly differently from that described on:
http://wiki.ltsp.org/wiki/Ltsp-manager/Initial_setup. If you do want the
WAN NIC to also serve images, ignore this page.

The problem using a 1-NIC set up is that the network card over which the
server gains membership and access to the wider network ALSO serves the
Ubuntu image to any computer in that larger subnet! In other words,
computers set to PXE-boot on that sub-net will boot to your Ubuntu image,
much to the surprise of the Windows user (and potential chagrin of the
Windows network Admin!) The solution is to prevent that LTSP-pnp server
from serving images on the WAN port.

This is achieved by a setting in a configuration file. There are two ways
to get the proper setting in place.

Perhaps the easiest is unplugging the network cable from the WAN port when
running the “Initial Setup” step: since you won’t have an external IP, a
proxy dhcp-range won’t be generated and so you avoid having to edit any
files.

However, if the initial setup has already been run, one can simply go to
the configuration file at: /etc/dnsmasq.d/ltsp-server-dnsmasq.conf find and
comment out the line: “dhcp-range=x.x.x.x,proxy” (Is rebooting or updating
the image necessary?)