kvbosse

Add the following chunk to your existing ISC dhcpd.conf file.

if exists user-class and ( option user-class = "iPXE" ) {
    filename "http://boot.smidsrod.lan/boot.ipxe";
}
else {
    filename "undionly.kpxe";
}

(or see https://gist.github.com/4008017 for a more elaborate setup

	option client-arch code 93 = unsigned integer 16;
	subnet 10.8.8.0 netmask 255.255.255.0 {
	range 10.8.8.100 10.8.8.199;
	option routers 10.8.8.1;
	option domain-name-servers 10.8.8.1;
	next-server 10.8.8.1;
	if exists user-class and option user-class = "iPXE" {
	filename "http://10.8.8.11/ipxeroot/bootstrap.ipxe";
	} elsif option client-arch != 0 {
	filename "ipxe.efi";

	ddns-update-style none;
	deny bootp; #default
	authoritative;

	include "/etc/dhcp/ipxe-option-space.conf";

	# GREEN (private network)
	subnet 10.1.1.0 netmask 255.255.255.0 {
	range 10.1.1.100 10.1.1.199;
	option subnet-mask 255.255.255.0;