Hi forgiven,
That’s correct.
Edge server is the required component for external access.
When deploying Edge server, you can’t add it to the domain, it needs to be a workgroup computer. Because it is required for external access, in order to ensure the security, you need to deploy it the DMZ area.
For the network adapter, you must have two network adapters, one for internal access the other one for external access.
You can use three public IPs (one to one) NAT to three private IPs for Lync Edge access service, Web Conferencing service, and A/V Edge service. You can also use one public IP for the three Lync Edge services.
The following document describes how to deploy Edge server for Skype for business, please refer to:
https://technet.microsoft.com/en-us/library/dn933903.aspx?
https://technet.microsoft.com/en-us/library/mt346415.aspx?
Hope this reply is helpful to you.
Regards,
Alice Wang
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