B85M-G Motherboard / RTL 8111G network interface card
How I solved the “No link detected on enp3s0 for 35 seconds, skipping it”
Just download https://fogproject.org/kernels/bzImage:
Then, renamed it to bzImageB85, and put it in /var/www/html/fog/service/ipxe and then configure Kernel in host/host group options to use this bzImageB85:
Hope it helps people that had this same problem.