Preseed default iPXE - AUTOINSTALL

gistfile1.txt

#!gpxe
<%#
kind: iPXE
name: Preseed default iPXE - AUTOINSTALL
model: ProvisioningTemplate
oses:
- Ubuntu
test_on:
- ubuntu4dhcp
description: |
  The template to render iPXE installation script for preseed based distributions
  The output is deployed on the host's subnet TFTP proxy.
  See https://ipxe.org/scripting for more details
-%>
<%
  iface = @host.provision_interface
  subnet4 = iface.subnet
  subnet6 = iface.subnet6
  ip = iface.ip
  mask = subnet4.mask
  gw = subnet4.gateway
  dns = subnet4.dns_servers.first

  if subnet4 && !subnet4.dhcp_boot_mode?
    ipconfig = "ip=#{ip}::#{gw}:#{mask}::::#{dns}"
  elsif subnet6 && !subnet6.dhcp_boot_mode?
    ipconfig = "ip=#{ip}::#{gw}:#{mask}::::#{dns}"
  else
    ipconfig = 'ip=dhcp'
  end
  
  image_path = @preseed_path.sub(/\/?$/, '.iso')
-%>
echo Trying to ping Gateway: ${netX/gateway}
ping --count 1 ${netX/gateway} || echo Ping to Gateway failed or ping command not available.
echo Trying to ping DNS: ${netX/dns}
ping --count 1 ${netX/dns} || echo Ping to DNS failed or ping command not available.

<% boot_files_uris = @host.operatingsystem.boot_files_uri(medium_provider) -%>
<% kernel = boot_files_uris[0] -%>
<% initrd = boot_files_uris[1] -%>

kernel <%= kernel %> initrd=initrd.img <%= ipconfig %> url=http://<%= @preseed_server %><%= image_path %> autoinstall ds=nocloud-net;s=http://<%= foreman_request_addr %>/userdata/ root=/dev/ram0 ramdisk_size=1500000 fsck.mode=skip rw auto
initrd <%= initrd %>

imgstat
sleep 2
boot

Thank you @anthonysomerset