@chadman00 While I don’t like to jump right into capturing network traffic, I think its going to be the easiest way to understand if you have the filters setup right with dhcp.
place a target computer on the same subnet as your fog server and dhcp server for the best picture of what is going on then follow this tutorial: https://forums.fogproject.org/topic/9673/when-dhcp-pxe-booting-process-goes-bad-and-you-have-no-clue
Take that pcap and look at it with wireshark. Looks at the OFFER response from your dhcp server. Make sure the boot file name is correct. If you are lost looking at the pcap upload it to a google drive and share it as public and post the link here and one of us will look at it to see if your dhcp server is responding correctly.