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Appendix B - Wireless Technology
202
NXD-700Vi 7" Modero® Wall/Flush Mount Touch Panel with Intercom
EAP communication overview
EAP Authentication goes a step beyond just encrypting data transfers, but also requires that a set of credentials
be validated before the client (panel) is allowed to connect to the rest of the network (FIG. 100). Below is a
description of this process. It is important to note that there is no user intervention necessary during this
process. It proceeds automatically based on the configuration parameters entered into the panel.
1. The client (panel) establishes a wireless connection with the WAP specified by the SSID.
2. The WAP opens up a tunnel between itself and the RADIUS server configured via the access point. This
tunnel means that packets can flow between the panel and the RADIUS server but nowhere else. The
network is protected until authentication of the client (panel) is complete and the ID of the client is
verified.
3. The WAP (Authenticator) sends an "EAP-Request/Identity" message to the panel as soon as the wireless
connection becomes active.
4. The panel then sends a "EAP-Response/Identity" message through the WAP to the RADIUS server
providing its identity and specifying which EAP type it wants to use. If the server does not support the
EAP type, then it sends a failure message back to the WAP which will then disconnect the panel. As an
example, EAP-FAST is only supported by the Cisco server.
5. If the EAP type is supported, the server then sends a message back to the client (panel) indicating what
information it needs. This can be as simple as a username (Identity) and password or as complex as
multiple CA certificates.
6. The panel then responds with the requested information. If everything matches, and the panel provides
the proper credentials, the RADIUS server then sends a success message to the access point instructing it
to allow the panel to communicate with other devices on the network. At this point, the WAP completes
the process for allowing LAN Access to the panel (possibly a restricted access based on attributes that
came back from the RADIUS server).
As an example, the WAP might switch the panel to a particular VLAN or install a set of firewall
rules.
FIG. 100 EAP security method in process
LAN
Client - Panel
(supplicant)
802.1x
(EAP over Wireless)
Authenticator
(Wireless Access Point)
Authentication Server
(RADIUS Server)