D-Link DES-3052 Spécifications télécharger pdf (Page 160)

DES-3028 DES-3028P DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch

Client

The Client is simply the endstation that wishes to gain access to the LAN or switch services. All endstations must be running

software that is compliant with the 802.1x protocol. For users running Windows XP, that software is included within the operating

system. All other users are required to attain 802.1x client software from an outside source. The Client will request access to the

LAN and or Switch through EAPOL packets and, in turn will respond to requests from the Switch.

Figure 10- 13. The Client

Authentication Process

Utilizing the three roles stated above, the 802.1x protocol provides a stable and secure way of authorizing and authenticating users

attempting to access the network. Only EAPOL traffic is allowed to pass through the specified port before a successful

authentication is made. This port is “locked” until the point when a Client with the correct username and password (and MAC

address if 802.1x is enabled by MAC address) is granted access and therefore successfully “unlocks” the port. Once unlocked,

normal traffic is allowed to pass through the port. The following figure displays a more detailed explanation of how the

authentication process is completed between the three roles stated above.

Figure 10- 14. The 802.1x Authentication Process

The D-Link implementation of 802.1x allows network administrators to choose between two types of Access Control used on the

Switch, which are:

1. Port-Based Access Control – This method requires only one user to be authenticated per port by a remote RADIUS server

to allow the remaining users on the same port access to the network.

2. MAC-Based Access Control – Using this method, the Switch will automatically learn up to sixteen MAC addresses by

port and set them in a list. Each MAC address must be authenticated by the Switch using a remote RADIUS server before

being allowed access to the Network.

Understanding 802.1x Port-based and MAC-based Network Access Control

The original intent behind the development of 802.1x was to leverage the characteristics of point-to-point in LANs. As any single

LAN segment in such infrastructures has no more than two devices attached to it, one of which is a Bridge Port. The Bridge Port

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D-Link DES-3052 Spécifications Page 160