D-Link DGS-3048 Product Manual - Page 93

Port-Based Network Access Control, 1x Authenticator Parameter

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DGS-3048 Gigabit Ethernet Switch Manual Port-Based Network Access Control The original intent behind the development of 802.1x was to leverage the characteristics of point-to-point in LANs. Any single LAN segment in such an infrastructures has no more than two devices attached to it, one of which is a Bridge Port. The Bridge Port detects events that indicate the attachment of an active device at the remote end of the link, or an active device becoming inactive. These events can be used to control the authorization state of the Port and initiate the process of authenticating the attached device if the Port is unauthorized. This is the Port-Based Network Access Control. Ethernet Switch RADIUS Server 802.1X Client 802.1X 802.1X 802.1X Client Client Client 802.1X Client 802.1X Client 802.1X Client ... 802.1X Client 802.1X Client Network access controlled port Network access uncontrolled port Figure 10- 6. Example of Typical Port-Based Configuration Once the connected Client has successfully been authenticated, the Port then becomes Authorized, and all subsequent traffic on the Port is not subject to access control restriction until an event occurs that causes the Port to become Unauthorized. Hence, if the Port is actually connected to a shared media LAN segment with more than one attached device, successfully authenticating one of the attached devices effectively provides access to the LAN for all devices on the shared segment. Clearly, the security offered in this situation is open to attack. 802.1x Authenticator Parameter To configure the 802.1x Authenticator Settings, click Configure 802.1x Authenticator Parameter 81

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DGS-3048 Gigabit Ethernet Switch Manual
Port-Based Network Access Control
The original intent behind the development of 802.1x was to leverage the characteristics of point-to-point in LANs. Any
single LAN segment in such an infrastructures has no more than two devices attached to it, one of which is a Bridge Port.
The Bridge Port detects events that indicate the attachment of an active device at the remote end of the link, or an active
device becoming inactive. These events can be used to control the authorization state of the Port and initiate the process of
authenticating the attached device if the Port is unauthorized. This is the Port-Based Network Access Control.
…
802.1X
Client
802.1X
Client
802.1X
Client
802.1X
Client
802.1X
Client
802.1X
Client
802.1X
Client
802.1X
Client
802.1X
Client
Network access controlled port
Network access uncontrolled port
RADIUS
Server
Ethernet Switch
Figure 10- 6. Example of Typical Port-Based Configuration
Once the connected Client has successfully been authenticated, the Port then becomes Authorized, and all subsequent traffic
on the Port is not subject to access control restriction until an event occurs that causes the Port to become Unauthorized.
Hence, if the Port is actually connected to a shared media LAN segment with more than one attached device, successfully
authenticating one of the attached devices effectively provides access to the LAN for all devices on the shared segment.
Clearly, the security offered in this situation is open to attack.
802.1x Authenticator Parameter
To configure the 802.1x Authenticator Settings, click
Configure 802.1x Authenticator Parameter
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