In 2010, Microsoft Forefront Unified Access Gateway (UAG) was released, which simplifies[1] the deployment of DirectAccess for Windows 2008 R2, and includes additional components that make it easier to integrate without the need to deploy IPv6 on the network, and with a dedicated user interface for the configuration and monitoring.
With Windows Server 2012, DirectAccess is fully integrated into the operating system, providing a user interface to configure and native IPv6 and IPv4 support.
All traffic to the intranet is encrypted using IPsec and encapsulated in IPv4 packets (if a native IPv6 connection cannot be established), which means that in most cases, no configuration of firewalls or proxies should be required.
The client can use 6to4, Teredo tunneling, or IP-HTTPS, provided the server is configured correctly to be able to use them.
DirectAccess With Windows Server 2008 R2 or UAG requires: DirectAccess With Windows Server 2012 requires: Smart card certificates, and health certificates for Network Access Protection may be used along with PKI.