Edubuntu in an existing network

[Gavin McCullagh]

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.

Alternatively, do you have two network cards?  If so, which is the dhcp
server listening on?

> 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?

> First try : the server and a TX linked over a crossed network cable.

So, are you now not on the above network?

> 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?

2. Is 192.168.1.25 the address of the edubuntu server?  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?



Gavin