Edubuntu in an existing network

[François BARILLON]

Le jeudi 14 décembre 2006 à 09:44 +0000, Gavin McCullagh a écrit :
> Hi,
> 
> On Wed, 13 Dec 2006, François BARILLON wrote:
> 
> > I'm trying to install an Edubuntu server on an existing LAN at the aim of
> > demonstration.
> 
> First question:  Are you using thin clients on this network?  If so, is
> there already a dhcp server on the network.  Be very careful bringing up a
> second dhcp server as things will likely act quite wierdly all over the
> network.
The network is in a documentation center. It is made of Windows XP
computers (able to boot in PXE) and of a Windows 2003 server. We would
like to be able to insert an Edubuntu server in the network and use the
other computers as thin clients (just for test and demonstration). The
Problem is the Windows 2003 server that is used for other tasks : it
can't be switched off.

Idea : is it possible to let the Windows dhcp do his work but enable
that the Edubuntu could send the tftpboot?
> 
> Alternatively, do you have two network cards?  If so, which is the dhcp
> server listening on? 
No, just one card.
------

To simplify the problem, we unplugged the Edubuntu server an another
computer, linked them with a croos-over cable.

> > Installation : the network card was seen as a wifi (worked fine after
> > fixing manualy the IP) (/etc/ltsp/dhcpd.conf was fixed in the same way).
> 
> If you're modifying dhcpd.conf (the config of the dhcp server), I presume
> you are running a dhcp server.  See above.
> 
> Also, you talk later about using a cross-over cable.  How can you be using
> a cross-over cable with a wireless card?
It's not a wireless card but the Edubuntu installer does'nt see it as a
proper interface for dhcp.

> 
> > 12:12:21.438025 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
> > Request from 00:0c:6e:4a:24:98 (oui Unknown), length: 548
> 
> thin client sends DHCP request.
> 
> > 12:12:21.453051 IP 192.168.1.25.32772 > 192.168.1.250.domain:  6886+
> > PTR? 255.255.255.255.in-addr.arpa. (46)
> 
> 192.168.1.25 makes DNS request of 192.168.1.250.
> 
> > 12:12:23.459483 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP,
> > Request from 00:0c:6e:4a:24:98 (oui Unknown), length: 548
> 
> thin client sends another DHCP request.
> 
> > 12:12:25.107455 IP 192.168.1.25.netbios-dgm > 192.168.1.255.netbios-dgm:
> > NBT UDP PACKET(138)
> 
> 192.168.1.25 makes Netbios request of server 192.168.1.250.
> 
> > 12:12:26.451470 arp who-has 192.168.1.250 tell 192.168.1.25
> 
> 192.168.1.25 makes arp request to try to find mac address of 192.168.1.250.
> 
> > 12:12:26.451501 IP 192.168.1.25.32772 > 192.168.1.250.domain:  6886+
> > PTR? 255.255.255.255.in-addr.arpa. (46)
> 
> 192.168.1.25 makes another DNS request of 192.168.1.250.
> 
> Some observations:
> 
> 1. No DHCP server responded.  Did you enable dhcp server on the edubuntu
>    server?  Is it listening on eth0?
Where can I see the interface it is listening?
> 
> 2. Is 192.168.1.25 the address of the edubuntu server?  
Yes.
> It seems to be
>    looking for DNS from 192.168.1.250.  Is that because it still has the
>    dns settings of your other network?
Peharps, I have to see this closer.

Thank you, Gavin, for your attention.

François