My configuration:
30 PC (Windows 10) --->Cisco Switch (default conf)----->ESXi((physical 192.168.80.2)----->vswitch(default conf)-------->(192.168.80.5)DRBL/CZillla(public IP)-------->WAN).
To Cisco switch is still connested a router with WAN (Internet) and DHCP server on LAN port (192.168.80.1) for these 30 PC.
This configuration works correctly when DRBL is on a physical computer, PC boot with PXE and get propely diskimage.
When DRBL/CloneziilaServer is in the ESXi environment, computers on the local network cannot load bootImage from DRBL environment, but client computers and the DRBL server(192.168.80.5) ping properly.