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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