Detecting Internal SSID
=======================

SSIDs are differentiated in the list from **Internal** to **Neighboring APs**.

Show Internal SSIDs
-------------------

#. Go to **Management > WLAN** in the top panel.
#. Find and click column labeled **Internal** in the main WLANs window. All
   internal APs will be identified with a checkmark in this column.

How to Find an Internal AP
--------------------------

The AP detected by the Genian NAC Agent and the wireless sensor can be
distinguished as an internally connected AP by several criteria. The Internal
AP detection method is as follows:

**MAC Similarity Check**

.. image:: /images/similarity.jpg
   :width: 600px

#. The network sensor collects the wired interface MAC information of the
   internally connected AP.
#. The wireless sensor collects the AP's wireless interface MAC information and
   sends it to the policy server.
#. Policy server compares the AP's wired and wireless interface MAC information
   and if they are similar, it determines that the access point is internal.

**Packet broadcasting**

.. image:: /images/packet.jpg
   :width: 600px

#. The network sensor broadcasts a virtual MAC to the network.
#. At this time, AP connected to the internal network broadcasts the virtual
   MAC received from the network sensor to the AP's wireless band.
#. The wireless sensor is monitoring the wireless network and when the wireless
   sensor receives the virtual MAC from the AP, it judges the AP as the
   internal AP.

**Agent**

#. The Agent collects all network interface information on user device.
#. This information is checked for matches against known network interface MAC
   addresses.

**SNMP with wireless controller**

#. Information is collected from wireless controller using SNMP.
#. This information is checked for matches against known MAC addresses from the
   wireless controller.