dhcpd.conf

option space pxelinux;
option pxelinux.configfile code 209 = text;
option pxelinux.pathprefix code 210 = text;
option pxelinux.reboottime code 211 = unsigned integer 32;
site-option-space "pxelinux";
if exists dhcp-parameter-request-list {
  # Always send the PXELINUX options (specified in hexadecimal)
  option dhcp-parameter-request-list = concat(option dhcp-parameter-request-list,d1,d2,d3);
}
authoritative;
default-lease-time 300;
max-lease-time 300;
option domain-name-servers 8.8.8.8, 8.8.4.4;
option subnet-mask 255.255.255.0;
option routers 10.10.10.2;
subnet 10.10.10.0 netmask 255.255.255.0 {
  range 10.10.10.100 10.10.10.254;

  host tcl {
    # TODO how to match System UUID instead of the MAC address?
    option dhcp-client-identifier 00:00:00:00:00:00:40:00:80:00:00:00:00:00:00:02;
    option dhcp-client-identifier "00000000-0000-0040-8000-000000000002";
    option dhcp-client-identifier "00000000000040008000000000000002";
    #hardware ethernet 08:00:27:00:00:02;
    option pxelinux.pathprefix "http://10.10.10.2/tcl/"; 
    filename "tcl/lpxelinux.0";
  }
}