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Figure 326 802.1X authentication procedure in EAP termination mode
In EAP termination mode, the network access device rather than the authentication server generates an
MD5 challenge for password encryption (see Step 4). The network access device then sends the MD5
challenge together with the username and encrypted password in a standard RADIUS packet to the
RADIUS server.
802.1X timers
This section describes the timers used on an 802.1X device to guarantee that the client, the device, and
the RADIUS server can interact with each other correctly.
• Username request timeout timer—Starts when the device sends an EAP-Request/Identity packet to
a client in response to an authentication request. If the device receives no response before this timer
expires, it retransmits the request. The timer also sets the interval at which the network device sends
multicast EAP-Request/Identity packets to detect clients that cannot actively request authentication.
• Client timeout timer—Starts when the access device sends an EAP-Request/MD5 Challenge packet
to a client. If no response is received when this timer expires, the access device retransmits the
request to the client.
• Server timeout timer—Starts when the access device sends a RADIUS Access-Request packet to the
authentication server. If no response is received when this timer expires, the access device
retransmits the request to the server.
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