Etherboot options using proxyDHCP in dnsmasq

[skyblaster]

I'm running the following container based on the app note here: https://ipxe.org/appnote/proxydhcp

podman run --rm --cap-add=NET_ADMIN,NET_RAW --net=host --volume=/var/home/core/tftpboot:/var/lib/tftpboot:Z quay.io/poseidon/dnsmasq:v0.5.0-37-gf41df2c \
  -d -q \
  --log-debug \
  --port=0 \
  --dhcp-option=vendor:PXEClient,6,2b \
  --dhcp-range=10.10.0.0,proxy \
  --dhcp-no-override \
  --dhcp-match=set:ipxe-http,175,19 \
  --dhcp-match=set:ipxe-https,175,20 \
  --dhcp-match=set:ipxe-menu,175,39 \
  --dhcp-match=set:ipxe-pxe,175,33 \
  --dhcp-match=set:ipxe-bzimage,175,24 \
  --dhcp-match=set:ipxe-iscsi,175,17 \
  --dhcp-match=set:ipxe-efi,175,36 \
  --dhcp-match=set:ipxe-priority,175,1 \
  --dhcp-match=set:ipxe-keep-san,175,8 \
  --tag-if=set:ipxe-ok,tag:ipxe-http,tag:ipxe-menu,tag:ipxe-iscsi,tag:ipxe-pxe,tag:ipxe-bzimage \
  --tag-if=set:ipxe-ok,tag:ipxe-http,tag:ipxe-menu,tag:ipxe-iscsi,tag:ipxe-efi \
  --pxe-service=tag:\!ipxe-ok,X86PC,PXE,undionly.kpxe,10.10.0.124 \
  --pxe-service=tag:\!ipxe-ok,IA32_EFI,PXE,snponlyx32.efi,10.10.0.124 \
  --pxe-service=tag:\!ipxe-ok,BC_EFI,PXE,snponly.efi,10.10.0.124 \
  --pxe-service=tag:\!ipxe-ok,X86-64_EFI,PXE,snponly.efi,10.10.0.124 \
  --pxe-service=tag:\!ipxe-ok,X86-64_EFI,PXE,snponly.efi,10.10.0.124 \
  --dhcp-boot=tag:ipxe-ok,http://boot.ipxe.org/demo/boot.php,,10.10.0.124 \
  --enable-tftp --tftp-root=/var/lib/tftpboot \
  --log-queries \
  --log-dhcp

For the life of me, I cannot replicate the default settings from TinyPXE, where the following is sent in the first DHCP Offer packet:

The issue:
Without ipxe-priority,175,1 being set correctly, my client (a Lenovo X390) thinks my TFTP server is at 10.10.0.1 (dnsmasq on OpenWrt), instead of 10.10.0.124 (dnsmasq proxyDHCP).

[skyblaster]

Huge shout out to Simon Kelley for introducing a new option --dhcp-option-pxe to resolve this issue.

After compiling from the latest source, something as simple as the following now includes option 175 in the DHCP Offer packets.

podman run --rm --cap-add=NET_ADMIN,NET_RAW --net=host --volume=/var/home/core/tftpboot:/var/lib/tftpboot:Z localhost/dnsmasq:latest dnsmasq \
  -d -q \
  --port=0 \
  --dhcp-range=10.10.0.0,proxy \
  --dhcp-option-pxe=encap:175,1,1 \
  --enable-tftp --tftp-root=/var/lib/tftpboot \
  --pxe-service=X86-64_EFI,PXE,snponly.efi,10.10.0.124 \
  --log-queries \
  --log-dhcp