dhcpd.conf

option arch code 93 = unsigned integer 16; # RFC4578

local-address 192.168.73.1;

class "pxeclients" {
   match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
   next-server 192.168.73.1;
   log(info, "PXE Client Detected");

   if exists user-class and option user-class = "iPXE" {
     filename "https://foreman.example.com:443/unattended/iPXE";
   } else if option arch = 00:06 {
     filename "grub2/bootia32.efi";
   } else if option arch = 00:07 {
     filename "grub2/bootx64.efi";
   } else {
     filename "pxelinux.0";
   }
}

class "httpclients" {
  match if substring (option vendor-class-identifier, 0, 10) = "HTTPClient";
  log(info, "HTTP UEFI Client Detected");
  option vendor-class-identifier "HTTPClient";

  if option arch = 00:0F {
    filename "http://192.168.73.1/pub/bootia32.efi";
  } else if option arch = 00:10 {
    filename "http://192.168.73.1/pub/grubx64.efi";
  }
}

subnet 192.168.73.0 netmask 255.255.255.0 {
  range 192.168.73.2 192.168.73.254;
  option domain-name-servers 192.168.73.1;
  option routers 192.168.73.1;
}