Uprade to 7.04

[Scott Ledyard]

It is normal for the thin clients to "count down" on the DHCP assigned IP
addresses on my installation of Edubuntu (not sure why!)
I believe Gavin was referring to two cards on the client machines, not on
the server which is, of course, requires two.
I've seen this kind of problem when there is more than one DHCP server on
the network. You don't have any other computers on this 10.0.0.0 network do
you? Make sure the switch your using is not connected to some other network
switch.
No matter what, the "tcpdump" scan that Gavin recommends you run on your
server should be helpful in diagnosing this problem. Have you had any luck
running that?

On 5/6/07, Ted Moore <tedmoore99 at satx.rr.com> wrote:
>
> Thanks for your reply.  I could not get any responses using the
> chatroom.  I
> am using two network cards; one to the school setup and the other to the
> outside world.  My outside world address is 192.168.0.100 and my school
> setup uses dhcp 10.0.0.20 - 10.0.0.250.
> When my thin clients do connect they all seem to be starting at 10.0.0.250
> and counting down.  Does that provide any additional info you can help me
> with?
>
> -----Original Message-----
> From: edubuntu-users-bounces at lists.ubuntu.com
> [mailto:edubuntu-users-bounces at lists.ubuntu.com] On Behalf Of Gavin
> McCullagh
> Sent: Sunday, May 06, 2007 10:36 AM
> To: edubuntu-users at lists.ubuntu.com
> Subject: Re: Uprade to 7.04
>
>
> On Sun, 06 May 2007, tedmoore99 at satx.rr.com wrote:
>
> > I am running a small (12 terminals) system and have recently upgraded
> > to 7.04.  Before upgrading the 12 terminals would connect in about 3 -
> > 5 minutes.  Since the upgrade, only about three terminals come up in 3
> > minutes.  The rest seem to hang up and I have to reboot several times.
> > After about one hour or more, all the terminals will eventually
> > connect. Is there something about 7.04 that I am unaware of that might
> > cause this behavior.  The messages I get from the non-connecting
> > terminals is "Searching for DHCP", then "NO IP", repeated many times.
>
> Strange, it sounds like your DHCP clients are not getting a response from
> the server.  That's sort of strange, particularly if you're using PXE
> network booting (which would imply you had already got a response from the
> dhcp server once).
>
> To check what's happening, you can run tcpdump somewhere on the network
> (say
> on the server) as the machine boots up.  You should be able to see
> requests
> and responses.  This command will do that for you:
>
>         sudo tcpdump -i eth0 | grep DHCP
>
> assuming eth0 is the network interface the dhcp is happening on.
>
> One thing that has happened to me a few times is that where there are two
> network cards in a machine, the PXE network card boots up and does the
> first
> DHCP, at which point the linux kernel comes up and attempts to get its IP
> address by DHCP on the other network card.  It might be worth checking you
> only have one network card.
>
> Gavin
>
>
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