Family, Your advice worked perfectly!
OK… So based on the excellent instructions here I tried a different Dell laptop and it worked with “undionly.kpxe” as option 67. Didn’t like “ipxe.efi”. So then I continued with the outstanding advice and upgraded the firmware on our Lenovo laptops and they worked great as long as I had “Legacy first” enabled under the UEFI.
So I am up and running 100% right now.
The fix for my specific issue in summary :
- Make sure that DCHP Scope option 66 has Fog Server IP
- Set Option 67 to be “undionly.kpxe”
- Firmware updates on any systems that won’t connect.