DHCP server sometimes not found

[Christopher Chan]

Sergio Dicandia wrote:
> Hi,
> 
> I'm finishing our new computer room with 12 thin clients and a 8.041 
> Edubuntu server. Everything seemed fine on the first clients I tested, 
> but I just found I can start no more than 4 or 5 at the same time.
> The other ones just wait for a DHCP to give them a valid IP address, and 
> there's no way to obtain it.

Are those that get ip addresses and those that do not get ip addresses 
the same machines each time round?

> I checked cabling and switch, but it's just a matter of who come first: 
> the first 4 (or 5) clients just get their IP, the other ones don't.
> Consider that in my /etc/ltsp/dhcpd.conf I put the correct MAC addresses 
> to assign fixed IPs, and they work fine for the first clients starting.

Are you using Cisco switches?