Manual

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the relative information of network management such as all kinds of alerting
information, terminated by terminal devices.
Length: represents the length of the data, that is, the length of the “Packet Body”, in byte.
There will be no following data domain when its value is 0.
Packet Body: represents the content of the data, which will be in different formats according to
different types.
2. The Format of EAP Data Packets
When the value of Type domain in EAPOL packet is EAP-Packet, the Packet Body is in EAP
format (illustrated in the next figure).
the Format of EAP Data Packets
Code: specifies the type of the EAP packet. There are four of them in total:
Request(1),Response(2),Success(3),Failure(4).
 There is no Data domain in the packets of which the type is Success or Failure, and
the value of the Length domains in such packets is 4.
 The format of Data domains in the packets of which the type is Request and Response
is illustrated in the next figure. Type is the authentication type of EAP, the content of
Type data depends on the type. For example, when the value of the type is 1, it means
Identity, and is used to query the identity of the other side. When the type is 4, it means
MD5-Challenge, like PPP CHAP protocol, contains query messages.
the Format of Data Domain in Request and Response Packets
Identifier: to assist matching the Request and Response messages.
Length: the length of the EAP packet, covering the domains of Code, Identifier, Length and
Data, in byte.
Data: the content of the EAP packet, depending on the Code type.