RE: Configuring dhcp-parameter-request-list dynamically

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Well, I think I figured out the problem.  It seems that the data type
that is expected is different depending on whether is "=" is used or
not.  Without it an ASCII string with the parameter list specified by
decimal numbers in a comma delimited list is what is used, but with it a
raw number (array of unsigned 8-bit integers) is expected.  I added the
following line (and commented out the one that was uncommented before)
and it worked:

option dhcp-parameter-request-list = concat(option
dhcp-parameter-request-list,d0,d1);

I had tried this before, but had tried decimal instead of hexadecimal
numbers and got "out of range" type errors (stating that the values were
greater than 255 (and since when is 208 > 255?--when the error message
is reported in a different base than the value in the config file is
interpreted in ;).

Actually, while I'm on the subject, is there any kind of logging I could
have turned on to get some sort of mismatched data type error or
something so I wouldn't have had to play with this for as long as I did?

Thanks,

Andy

-----Original Message-----
From: dhcp-server-bounce@xxxxxxx [mailto:dhcp-server-bounce@xxxxxxx] On
Behalf Of Andy Wray
Sent: Monday, January 27, 2003 1:03 AM
To: dhcp-server@xxxxxxx
Subject: Configuring dhcp-parameter-request-list dynamically

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***

Hello all,
 
I'm trying to pass some additional parameters in the DHCP response from
the server for network booting with pxelinux.  The recommended way to do
this according to the pxelinux docs is to use the "append" keyword,
however this appears to only be valid for the dhclient.conf file rather
than the dhcpd.conf file.  I tried to work around this using the normal
evaluation syntax, but it doesn't seem to work.  I've posted my
dhcpd.conf file below.  I'm using the ISC DHCP server v 3.0.1rc9 on Red
Hat Linux 7.3 using a pre-compiled binary (RPM) from one of the links
off the ISC site.  Can anyone either tell me what I'm doing wrong, or
confirm that this is a bug in the DHCP server code?  (BTW, you'll see
from the commented lines below, I've tried several things, none of which
work, except for the uncommented line, which is, of course, not
dynamic).
 
 
ddns-update-style interim;
use-host-decl-names on;
allow bootp;
allow booting;
option space pxelinux;
option pxelinux.magic      code 208 = string;
option pxelinux.configfile code 209 = text;
option pxelinux.pathprefix code 210 = text;
option pxelinux.reboottime code 211 = unsigned integer 32;
 
 
subnet 10.90.90.0 netmask 255.255.255.0 {
  option dhcp-renewal-time 536870910;
  option dhcp-rebinding-time 536870911; 
  option dhcp-lease-time -1;
  option routers 10.90.90.1;
  option domain-name-servers 10.90.90.1;
  option domain-name "bay13";
  next-server 10.90.90.1;
  filename "pxelinux.0";
  option root-path "11.1.1.254:/opt/ltsp/i386000";
  option vendor-encapsulated-options 01:04:00:00:00:00;
  option vendor-class-identifier "PXEClient"; 
  option pxelinux.magic f1:00:74:7e;
  site-option-space "pxelinux";
  if exists dhcp-parameter-request-list {
    #append dhcp-parameter-request-list 208, 209, 210, 211; -- This
actually replaces the entire list, rather than appending these values
    #option dhcp-parameter-request-list =
concat(binary-to-ascii(10,8,",",option
dhcp-parameter-request-list),",208,209");
    #option dhcp-parameter-request-list = concat( "1,2,3,","208,209" );
-- Just for testing a simple case
    #option dhcp-parameter-request-list = "1,2,3,208,209"; -- Even this
does not work
    option dhcp-parameter-request-list 1,2,3,208,209;
    
  }
  log (info,concat("*** dhcp-parameter-request-list:
",binary-to-ascii(10,8,",",config-option dhcp-parameter-request-list),"
***"));
  option pxelinux.configfile =
    concat("pxelinux.cfg/", binary-to-ascii(16, 8, "-",
substring(hardware,1,6)));
  range dynamic-bootp 10.90.90.3 10.90.90.254;
}
 
 
 
Thanks,
 
Andy



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