@george1421 Yes it is. Both, the fog server and the host device, are in VirtualBox - and i get the error message.
But tbh if the problem doesn’t show up when deploying the whole system in my network, i can live with the error occurring in VB.

If it’s true that this only happens in VB and not on the actual network (and then Toms solution works), then this issue is resolved for me.

@mecsr Great. I’m glad you have it working.

Just as a word of warning, don’t advanced past the 4.15.2 version of the kernel until you update FOG, and even then stick with 4.15.2 until the developers can dig into why 4.17.0 is acting slow.

With help From Geroge1421 we discovered that there was a rouge DHCP server connected to the network. It was running from a VM on a regular PC. Network admins were able to locate the port relates to the MAC address of the rouge server.

Now PXE is booting to FOG smoothly