Hi Randall,
Thanks so much for answering. I was trying to use the Option 2, to stand up a new version of ArcGIS Enterprise on new equipment. It was Option 2 in Derek Laws white paper on migrating from ArcGIS Server to ArcGIS Enterprise. Once the new version of Enterprise is working correctly, we were just going to take ArcGIS Server 10.2.1 down.
I certainly see your point of not exposing the SQL Server data, ArcGIS Server and ArcGIS Portal on the forward facing server.
However this means I can't use the Enterprise Builder, if I must put the two Web Adaptors on the Forward Facing server in the DMZ zone, right?? Enterprise Builder puts all the components on one server.
Thanks so much for your help.
Janie