next-server 192.168.1.207;
  
  if exists user-class and option user-class = "iPXE" {
      filename "http://192.168.1.207/boot.ipxe";
  } elsif option client-architecture = 00:00 {
      filename "undionly.kpxe";
  } else {
      filename "ipxe.efi";
  }