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3com WX3000 Manuel D’Utilisation

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03: Indicates that the packet is an EAPoL-key packet, which carries key information. 
04: Indicates that the packet is an EAPoL-encapsulated-ASF-Alert packet, which is used to support 
the alerting messages of ASF (alerting standards forum). 
z 
The Length field indicates the size of the Packet body field. A value of 0 indicates that the Packet 
Body field does not exist.  
z 
The Packet body field differs with the Type field. 
Note that EAPoL-Start, EAPoL-Logoff, and EAPoL-Key packets are only transmitted between the 
supplicant system and the authenticator system. EAP-packets are encapsulated by RADIUS protocol to 
allow them successfully reach the authentication servers. Network management-related information 
(such as alarming information) is encapsulated in EAPoL-Encapsulated-ASF-Alert packets, which are 
terminated by authenticator systems. 
The format of an EAP packet 
For an EAPoL packet with the value of the Type field being EAP-packet, its Packet body field is an EAP 
packet, whose format is illustrated in 
Figure 1-4 The format of an EAP packet 
 
 
In an EAP packet: 
z 
The Code field indicates the EAP packet type, which can be Request, Response, Success, or 
Failure. 
z 
The Identifier field is used to match a Response packet with the corresponding Request packet. 
z 
The Length field indicates the size of an EAP packet, which includes the Code, Identifier, Length, 
and Data fields. 
z 
The Data field carries the EAP packet, whose format differs with the Code field. 
A Success or Failure packet does not contain the Data field, so the Length field of it is 4. 
 shows the format of the Data field of a Request packet or a Response packet. 
Figure 1-5 The format of the Data field of a Request packet or a Response packet 
 
 
z 
The Type field indicates the EAP authentication type. A value of 1 indicates Identity and that the 
packet is used to query the identity of the peer. A value of 4 represents MD5-Challenge (similar to 
PPP CHAP) and indicates that the packet includes query information. 
z 
The Type Date field differs with types of Request and Response packets.