Hi Marius,
Based on my knowledge, subnets and AD sites are two different concept. For BranchCache, AD Sites is one of the key components here. And according to the Microsoft, one of the requirements for BranchCache is AD sites. Active Directory sites are
used to limit the scope of hosted cache servers that are automatically discovered
So I'm afraid, if only subnets in the environments, it couldn't support.
https://technet.microsoft.com/en-us/library/jj572990(v=ws.11).aspx
Best Regards,
Mary
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