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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
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802.1X
802.1X (Port-based and Host-based Access Control)
The IEEE 802.1X standard is a security measure for authorizing and authenticating users to gain access to various
wired or wireless devices on a specified Local Area Network by using a Client and Server based access control
model. This is accomplished by using a RADIUS server to authenticate users trying to access a network by relaying
Extensible Authentication Protocol over LAN (EAPOL) packets between the Client and the Server.
The following figure represents a basic EAPOL packet:
Figure 9-4 The EAPOL Packet
Utilizing this method, unauthorized devices are restricted from connecting to a LAN through a port to which the user is
connected. EAPOL packets are the only traffic that can be transmitted through the specific port until authorization is
granted. The 802.1X access control method has three roles, each of which are vital to creating and up keeping a
stable and working Access Control security method.
Figure 9-5 The three roles of 802.1X
The following section will explain the three roles of Client, Authenticator, and Authentication Server in greater detail.
Authentication Server
The Authentication Server is a remote device that is connected to the same network as the Client and Authenticator,
must be running a RADIUS Server program and must be configured properly on the Authenticator (Switch). Clients
connected to a port on the Switch must be authenticated by the Authentication Server (RADIUS) before attaining any
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