[K12OSN] Need help integrating LTSP Server into school network

Bill Moseley moseley at hank.org
Tue Jan 29 16:11:36 UTC 2008

On Tue, Jan 29, 2008 at 09:13:13AM -0600, pstech at insightbb.com wrote:
> Devry,
> You should have a dual network card setup on your LTSP server, and
> what I would recommend that you do is to set up the second NIC to
> use DHCP and plug it into the school network. It should pick up an
> IP address/subnet mask, default gateway, and DNS server info. After
> doing this, try to access the internet from the server. You may find
> that your issue is resolved. 

Can someone fill in the steps here?  I'm using Edubuntu so my
configuration is likely different.

My *Edubuntu* server uses eth1 for connecting to the local LAN and
uses dhcpd.  So in my /etc/network/interfaces I have:

    auto eth1

And then on Ubuntu NetworkManager handles connecting via dhcp client.

On Debian I have:

    auto eth1
    iface eth1 inet dhcp

My eth0 is what connects to my switch and to the clients.

    auto eth0
    iface eth0 inet static
        # Enable NAT for non-thin clients.
        up iptables-restore < /etc/ltsp/nat.conf

Now, since I'm running dhcpd on the LTSP server I only want it to
listen on eth0, not eth1 which would conflict with the LAN's dhcpd.

On Ubuntu in /etc/default/dhcp3-server I have:


And finally, to allow the ltsp clients (or any computer that connects
to the ltsp switch) to use access the LAN (and thus the Internet) I
have have /etc/ltsp/nat.conf:

    # Generated by iptables-save v1.3.6 on Sun Nov  4 10:38:59 2007
    :OUTPUT ACCEPT [2:504]
    # Completed on Sun Nov  4 10:38:59 2007

> As an alternative, you can give the NIC card a static address
> assuming that you get the proper IP address/default gateway/DNS
> server info from your IT person.

Which would be similar to the "static" setting above.

Bill Moseley
moseley at hank.org

More information about the K12OSN mailing list