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Industrial Managed
Ethernet Switch – EH9711
User Manual
Page
60
of
223
This feature provides access control on a port basis. There are two types of authentications:
IEEE 802.1X
and
MAC-based
.
The 802.1X supports
Port-based 802.1X
authentication type. The following three terms are used in the 802.1X context:
Supplicant
,
Authenticator,
and the
Authentication server
. The Supplicant is the client (PC) with some 801.1X software, where
the Authenticator is the switch, and the Authentication server is such as a RADIUS server. The supplicant/client is connected
to the authenticator/switch on some port, and the authenticator can reach an authentication server. The idea is that the supplicant
wants access to the port, so it sends an
Extensible Authentication Protocol over LAN
(EAPoL) message to the authenticator,
which in turn asks the authenticator server if this supplicant can be accepted. Then the authenticator opens the port for the
supplicant, and communication can begin. Depending on how the authenticator is configured, this process behaves in different
ways.
In
Port-based 802.1X
, if the supplicant S is on network N (connected to the authenticator on Port A) and S opens Port A, then
everyone on network N will have access. However, only the supplicant that opened the port on the authenticator is allowed to
transmit and receive packets. This is done through the MAC address of the supplicant.
A supplicant can be seen as a combination of a client and a supplicant component (that takes care of negotiating the port
opening when the client transmits the first packet). This embedded supplicant component then uses the MAC address of the
client as the username and password in the form aa-bb-cc-dd-ee-ff. This has the advantage that the client does not need to have
supplicant software.
The
Configuration
Security
Network
NAS
(Network Access Server) webpage as shown in Figure 2.54 allows the user
to configure the IEEE 802.1X and MAC-based authentication system and port settings. The NAS configuration consists of two
sections: a system- (
System Configuration
) and a port-wide (
Port Configuration
). Table 2.35 provides detailed descriptions
of options for both System Configuration and Port Configuration.
Figure 2.54 Webpage
to Configure Network NAS
Table 2.35 Descriptions of Network NAS
Label
Description
Factory Default
System Configuration
Mode
Indicates if NAS is globally enabled or disabled on the switch. If globally
disabled, all ports are allowed forwarding of frames.
Disabled
Reauthentication
Enabled
If checked, successfully authenticated supplicants/clients are
reauthenticated after the interval specified by the Reauthentication Period.
Reauthentication for 802.1X-enabled ports can be used to detect if a new
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