Breaking loop by checking iPXE special feature?

[foresty]

(2019-12-10 06:54)NiKiZe Wrote:  so you are checking all 4 ? if so post all of the relevant part of your dhcp config, not just a snippet.
Also describe your issue more clearly.

example:
PXE rom start, that loads iPXE, which then loads iPXE again, I would expect it to load script x instead.

1. My iPXE host works good(I mean chainload good) for VM on ESXi or bare metal machine, but can't chainload VM on XenServer 6.5
2. On the good "My iPXE" host, I only changing one line by checking one of "https/ftp/nfs/comboot" features per test, got failed. Then checking second, failed; then third, failed; then fourth, faild.
3. Every time, I only changed this line ("My ISC dhcpd.conf" below):
if exists user-class and option user-class = "iPXE" {
to
if exists ipxe.<ONE of "https/ftp/nfs/comboot"> {
4. Every test, I have compared with VM ESXi:
For VM on XenServer 6.5:
ROM old-iPXE start => load MyiPXE (with my expected features) => then load MyiPXE again => then again ...again...
(Compared)For VM on ESXi:
ROM PXE start => load MyiPXE (with my expected features) => then load MyiPXE again => then again ...again...

##### My ISC dhcpd.conf (Only removed/replaced comments/confidential info) #####
bash-4.2# cat /etc/dhcp/dhcpd.conf
default-lease-time 600;
max-lease-time 7200;

log-facility local7;

option domain-name "mydomain.org";
option domain-name-servers 192.168.0.201,114.114.114.114,8.8.8.8;
allow booting;
allow bootp;

# Support define user-class
option user-class code 77 = string;

# Support iPXE options
option space ipxe;
option ipxe-encap-opts code 175 = encapsulate ipxe;
option ipxe.priority code 1 = signed integer 8;
option ipxe.keep-san code 8 = unsigned integer 8;
option ipxe.skip-san-boot code 9 = unsigned integer 8;
option ipxe.syslogs code 85 = string;
option ipxe.cert code 91 = string;
option ipxe.privkey code 92 = string;
option ipxe.crosscert code 93 = string;
option ipxe.no-pxedhcp code 176 = unsigned integer 8;
option ipxe.bus-id code 177 = string;
option ipxe.san-filename code 188 = string;
option ipxe.bios-drive code 189 = unsigned integer 8;
option ipxe.username code 190 = string;
option ipxe.password code 191 = string;
option ipxe.reverse-username code 192 = string;
option ipxe.reverse-password code 193 = string;
option ipxe.version code 235 = string;
option iscsi-initiator-iqn code 203 = string;
# iPXE feature indicators
option ipxe.pxeext code 16 = unsigned integer 8;
option ipxe.iscsi code 17 = unsigned integer 8;
option ipxe.aoe code 18 = unsigned integer 8;
option ipxe.http code 19 = unsigned integer 8;
option ipxe.https code 20 = unsigned integer 8;
option ipxe.tftp code 21 = unsigned integer 8;
option ipxe.ftp code 22 = unsigned integer 8;
option ipxe.dns code 23 = unsigned integer 8;
option ipxe.bzimage code 24 = unsigned integer 8;
option ipxe.multiboot code 25 = unsigned integer 8;
option ipxe.slam code 26 = unsigned integer 8;
option ipxe.srp code 27 = unsigned integer 8;
option ipxe.nbi code 32 = unsigned integer 8;
option ipxe.pxe code 33 = unsigned integer 8;
option ipxe.elf code 34 = unsigned integer 8;
option ipxe.comboot code 35 = unsigned integer 8;
option ipxe.efi code 36 = unsigned integer 8;
option ipxe.fcoe code 37 = unsigned integer 8;
option ipxe.vlan code 38 = unsigned integer 8;
option ipxe.menu code 39 = unsigned integer 8;
option ipxe.sdi code 40 = unsigned integer 8;
option ipxe.nfs code 41 = unsigned integer 8;

# Support gPXE options
option space gpxe;
option gpxe-encap-opts code 175=encapsulate gpxe;
option gpxe.bus-id code 177=string;

# Support UEFI options
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;
option client-arch code 93 = unsigned integer 16;

# Detect if PXE client is already iPXE
if exists user-class and option user-class = "iPXE" {
filename "http://pxe.mydomain.org/ipxe/boot.ipxe";
} else {
next-server 192.168.0.201;
if exists client-arch {
# Support UEFI
if option client-arch = 00:00 {
filename "undionly.kpxe";
} elsif option client-arch = 00:02 {
filename "ipxe32.efi";
} elsif option client-arch = 00:06 {
filename "ipxe32.efi";
} elsif option client-arch = 00:07 {
filename "snponly.efi";
} elsif option client-arch = 00:08 {
filename "snponly.efi";
} elsif option client-arch = 00:09 {
filename "snponly.efi";
} elsif option client-arch = 00:0a {
filename "bin-arm32-efi/ipxe.efi";
} elsif option client-arch = 00:0b {
filename "bin-arm64-efi/ipxe.efi";
} else {
filename "undionly.kpxe";
}
}
}

include "/etc/dhcp/conf.d/fixed_address.conf";
include "/etc/dhcp/conf.d/a1.conf";
include "/etc/dhcp/conf.d/a4.conf";
<include lines... and so on>
bash-4.2#