R3303-HP HSR6800 Routers Security Configuration Guide

Value T

Descri

tion

0x02 EAPOL-Logoff

The client sends an EAPOL-Logoff message to tell the network access

device that it is logging off.

• Length—Data length in bytes, or length of the Packet body. If packet type is EAPOL-Start or

EAPOL-Logoff, this field is set to 0, and no Packet body field follows.

• Packet body—Content of the packet. When the EAPOL packet type is EAP-Packet, the Packet body

field contains an EAP packet.

EAP over RADIUS

RADIUS adds two attributes, EAP-Message and Message-Authenticator, for supporting EAP

authentication. For the RADIUS packet format, see "Configuring AAA."

EAP-Message

RADIUS encapsulates EAP packets in the EAP-Message attribute, as shown in Figure 31. The Type field

takes 79, and the Value field can be up to 253 bytes. If an EAP packet is longer than 253 bytes, RADIUS

encapsulates it in multiple EAP-Message attributes.

Figure 31 EAP-Message attribute format

Message-Authenticator

RADIUS includes the Message-Authenticator attribute in all packets that have an EAP-Message attribute

to check their integrity. The packet receiver drops the packet if the calculated packet integrity checksum

is different from the Message-Authenticator attribute value. The Message-Authenticator prevents EAP

authentication packets from being tampered with during EAP authentication.

Figure 32 Message-Authenticator attribute format

Initiating 802.1X authentication

Both the 802.1X client and the access device can initiate 802.1X authentication.

802.1X client as the initiator

The client sends an EAPOL-Start packet to the access device to initiate 802.1X authentication. The

destination MAC address of the packet is the IEEE 802.1X specified multicast address

01-80-C2-00-00-03 or the broadcast MAC address. If any intermediate device between the client and