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DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch
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Figure 6 - 9 MAC Blocked List window
To find an unauthorized device MAC address that has been blocked by the IP-MAC binding restrictions, enter the VLAN Name
and MAC Address in the appropriate fields and click Find. To delete an entry, click the Delete button next to the entry’s port. To
delete all the entries in this window, click Delete All.
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 6 - 10 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 holds three roles, each of which are vital to creating and upkeeping a stable and working Access Control
security method.
Figure 6 - 11 The three roles of 802.1X
The following section will explain the three roles of Client, Authenticator, and Authentication Server in greater detail.
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