Intel PXE bootroms

Felix Rauch rauch at
Fri Jul 20 07:31:53 PDT 2001

On Thu, 19 Jul 2001, Gary Jackson wrote:
> I'm having some trouble getting machines using Intel PXE bootroms
> netbooting.  The machine with the DHCP server sees their requests, and
> responds, but the clients don't seem to want to boot with what they've
> been given.  Once Linux is up, I have no problem getting an IP through
> DHCP.  Portfast is enabled on all relevant switch ports.
> I haven't had any problem getting nodes with 3com PXE bootroms to
> boot.

We once had a similar problem with some PXE bootroms. It seems that
some version of them need two ports for their DHCP protocol: They
first communicate on the default DHCP-port (somwhere between 60 and 90
IIRC), but after getting the answer they try another request on a much
higher port (1000-2100?). I once solved that problem by having another
additional PXE-software running on our DHCP-server. Unfortunately I
don't remember the details of that software :-(

You might want to try tcpdump to see if your NICs behave in the same

Luckily we have now NICs which do not have that problem.

Felix Rauch                      | Email: rauch at
Institute for Computer Systems   | Homepage:
ETH Zentrum / RZ H18             | Phone: ++41 1 632 7489
CH - 8092 Zuerich / Switzerland  | Fax:   ++41 1 632 1307

More information about the Beowulf mailing list