I took this off list with Devon IT and they very quickly solved the issue for me.
I'm not sure if something changed in edubuntu's LTSP implementation, but a simple BIOS update to the 6020s and I'm back up and running.
---- Luis Montes <firstname.lastname@example.org> wrote:
> I have 70 thin clients mostly disklessworkstation.com T150s, but a good
> 25 or so ntavo 6020s.
> Recently the 6020s decided to that they could get an IP address from the
> dhcp server but then timeout when trying to contact the tftp server.
> All of the T150s are booting fine. This is on a fully updated edubuntu
> Any ideas?
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