xStack DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
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Client
The Client is simply the workstation that wishes to gain access to the LAN or switch services. All workstation 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 6- 86. Client
Authentication Process
Utilizing the three components 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 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. The Switch using a remote RADIUS server before being allowed access to the Network must
authenticate each MAC address.
