You will need to create two virtual switches - one that will use the NIC connected to the outside world and one that is connected to the NIC on the management network. This allows for you to assign virtual NICs to your VMs with associated IP address and be able to access them as a web server form the internet or to manage form your protectted network - as long as your are comfortable with the security of the openBSD OS and it is configured preperly there should be no issue of someone gaining access to your ESXi host -
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