D-Link DES-1228P - Manual (Page 59)

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available to the user, or the user is denied access to the network.
The RADIUS servers make the network a lot easier to manage for the
administrator by gathering and storing the user lists
.
Figure 44 – Security > 802.1X Setting
By default, 802.1X is Disabled. To use EAP for security, select
Enabled and set the 802.1X Global Settings for the Radius Server and
applicable authentication information.
Authentication Port: sets primary port for security monitoring.
Default is 1812.
Key: Masked password matching the Radius Server Key.
Confirm Key: Enter the Key a second time for confirmation.
TxPeriod: Sets the number of seconds that the switch waits for a
response to an EAP-request/identity frame from the client before
retransmitting the request. Default is
24 seconds.