DirectAccess

Windows 7 Enterprise and Ultimate editions with Windows Server 2008 R2 introduce a new feature, DirectAccess, which allows remote users to securely access enterprise shared drives, Web sites, and applications without connecting to a virtual private network (VPN). This is possible because DirectAccess establishes a bidirectional connection with a user's enterprise network every time the system connects to the Internet. This connection occurs even prior to the user logging on. Allowing continuous connectivity to the enterprise environment has many benefits, such as simplicity for end users, network, and IT administrators.

DirectAccess uses IPv6 as it uses globally routable addresses. If your organization is not yet moving to IPv6, other options like 6to4, Teredo, and NATPT may be configured for similar functionality.