Apply Group Policy to external clients

Question

Is it possible to apply GPO's to clients on external networks such as their own personal networks. I'm looking at solutions such as authenticating them through a proxy on the perimeter network and are pushed to the Domain Controller to force these policies.
As it stands, the clients use a VPN client to gain access to the corporate network, and I know that group policy will use the Network Location Service to detect the Domain Controller, but the VPN connection is not mandatory and most be established by the client,
if this connection is not required for their job, the may never connect and not get updated GPO's.

Answer 1

Hi,
I agree with Joseph. Unlike many traditional VPN connections, which must be initiated and terminated by explicit user action, DirectAccess connections are designed to connect automatically as soon as the computer connects to the Internet.
Regarding DirectAcces, the following articles can be referred to for more information.
Using DirectAccess
http://technet.microsoft.com/en-in/windows/dn168168.aspx
Windows Server 2012 Direct Access – Part 1 What’s New
http://blogs.technet.com/b/meamcs/archive/2012/05/03/windows-server-2012-direct-access-part-1-what-s-new.aspx
In addition, for this question mainly focuses on network, in order to get more and better help, we can also ask for suggestions in the following forum.
Network Access Protection
https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=winserverNAP
Best regards,
Frank Shen