WLAN While Docking

By default, connecting a platform to a wired LAN usually causes it to disconnect from any WLAN that may be in use. This is called adapter switching, and is implemented by the operating system in Windows 8 and above, or by adapter switching software such as the Intel PROSet/Wireless Software in Windows 7.

This disabling of the WLAN takes place even if the network interface that connects to the wired LAN is a peripheral (such as a network interface located on USB or in a docking station). This can present an issue, because it means that a platform currently connected to a peripheral wired LAN connection cannot use Intel AMT: Intel AMT connections cannot be used over the wired LAN because the peripheral is not a vPro-capable, embedded connection; and the WLAN is disabled.

 Note:

In Windows 8 and above, the default adapter switching settings do allow for user-initiated CIRA connections over the WLAN; however, all other Intel AMT connections cannot be established.

Therefore, in order for Intel AMT to function while the platform is connected to a peripheral network adapter, adapter switching must be at least partially disabled. This enables Intel AMT to use the WLAN interface. The procedure differs depending on the operating system, because of the aforementioned difference in how adapter switching is handled: by the operating system in Windows 8 and above, and by the Intel PROSet/Wireless Software in Windows 7.

   In Windows 8 and above, the adapter switching policy is set using the WcmSetProperty function in the Windows API. By default, the “Minimize simultaneous connections” policy is enabled, and the “Prohibit interconnect between domain and non-domain networks” policy is disabled. To enable Intel AMT while docking, make the following changes:

   (required) Disable “Minimize simultaneous connections”

   (recommended) Enable “Prohibit interconnect between domain and non-domain networks”

See the Windows API documentation for details on the function.

   In Windows 7, the ability to create an exception for Intel AMT when disabling the WLAN was added to PROSet and to the LMS in Intel AMT version 11.5. If the platform does not have an embedded wired LAN connection, this exception is enabled by default. However, if your platform has such a connection but you plan to use a peripheral wired LAN connection, you must manually create a DWORD registry key named OverrideProsetAdapterSwitching in HKEY_LOCAL_MACHINE\SOFTWARE\Intel\IntelAMTUNS. When the LMS service starts up, it checks for the existence of the key. If the key is present and has a value other than 0, Intel AMT will be able to use the WLAN even if it has been disabled due to an existing wired LAN connection (but not if it has been disabled for another reason). 

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