> addresses for ltsp workstations. I'm trying to avoid using the
> mac-address for pointing out which workstations are ltsp-terminals. The
> network has both the ltsp-workstations and workstations running Windows
> and Mac OS. Because of the different options going into the dhcp-reply
> depending on the client I'm trying to distinguish between them in the
> dhcp-server. It's no problem detecting when Etherboot is requesting but
> when the ltsp kernel send its request I don't know how I can detect
> this. Is it possible to let dhcp-client in the kernel use a special
> user-class option? Any ideas...

I will tell you how I solved a similar problem, but it isn't pretty. I had an
over-eager NT server in the same subnet sticking its response to every DHCP.
This problem exists even if I use MAC addresses in the Linux DHCP server. I
found the "vendor encapsulated options (VCI?)" documentation, but I didn't
find anything corresponding for dhclient. 

Therefore I told the DHCP server to use ports 1001 and 1002. Then for PCMCIA
clients it is simply a matter of adding the -p option to the dhclient
invocation in the linuxrc (the port numbers are reversed for the client). This
much I did and it works. For the non-PCMCIA clients which download the kernel
from the LSP server it is a matter of compiling the Etherboot images yourself
instead of getting them from the web page. The file to change is etherboot.h.
The lines are:
   #define BOOTP_SERVER    1001    
   #define BOOTP_CLIENT    1002
Since my non-PCMCIA clients haven't crashed yet, I haven't done this part.





-bhaskar


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