D-Link DES-3028 User Manual page 212

DES-3028 DES-3028P DES-3028G DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
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:
NOTE: If the client is authenticated with 802.1X authentication it allows the user to force down the
authenticated client via SNMP on R2 with the Radius command item in auth.mib(OID:
1.3.6.1.4.1.171.12.3.7) by port based or Host-based.
NOTE: If the session timeout attribute on the radius server is set, the client will be off-line
when the client authenticated over the timeout value has been configured on the radius
server.
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 consists of three roles, each of which are vital to creating and maintaining a stable and working Access
Control security method.
The following section will explain the three roles of Client, Authenticator and Authentication Server in greater detail.
Figure 10- 14. The EAPOL Packet
Figure 10- 15. The three roles of 802.1X
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