4000 Router Series Security Configuration Guide

Packet formats

EAP packet format

Figure 17 shows the EAP packet format.

Figure 17 EAP packet format

• Code—Type of the EAP packet. Options include Request (1), Response (2), Success (3), or Failure

(4).

• Identifier—Used for matching Responses with Requests.

• Length—Length (in bytes) of the EAP packet. The EAP packet length is the sum of the Code, Identifier,

Length, and Data fields.

• Data—Content of the EAP packet. This field appears only in a Request or Response EAP packet. The

Data field comprises the request type (or the response type) and the type data. Type 1 (Identify) and

type 4 (MD5-challenge) are two examples for the type field.

EAPOL packet format

Figure 18 shows the EAPOL packet format.

Figure 18 EAPOL packet format

• PAE Ethernet type—Protocol type. It takes the value 0x888E for EAPOL.

• Protocol version—The EAPOL protocol version used by the EAPOL packet sender.

• Type—Type of the EAPOL packet. Table 4 lists the t

ypes of EAPOL packets supported by HP

implementation of 802.1X.

Table 4 Types of EAPOL packets

Value T

Descri

tion

0x00 EAP-Packet

The client and the network access device uses EAP-Packets to transport

authentication information.

0x01 EAPOL-Start

The client sends an EAPOL-Start message to initiate 802.1X

authentication to the network access device.

015

PAE Ethernet type

Packet body

TypeProtocol version

Length