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2.2. Packet Format Connected: An Internet Encyclopedia
2.2. Packet Format

Up: Connected: An Internet Encyclopedia
Up: Requests For Comments
Up: RFC 1334
Up: 2. Password Authentication Protocol
Prev: 2.1. Configuration Option Format
Next: 2.2.1. Authenticate-Request

2.2. Packet Format

2.2. Packet Format

Exactly one Password Authentication Protocol packet is encapsulated in the Information field of a PPP Data Link Layer frame where the protocol field indicates type hex c023 (Password Authentication Protocol). A summary of the PAP packet format is shown below. The fields are transmitted from left to right.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Code      |  Identifier   |            Length             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    Data ...
   +-+-+-+-+

Code

The Code field is one octet and identifies the type of PAP packet. PAP Codes are assigned as follows:

         1       Authenticate-Request
         2       Authenticate-Ack
         3       Authenticate-Nak

Identifier

The Identifier field is one octet and aids in matching requests and replies.

Length

The Length field is two octets and indicates the length of the PAP packet including the Code, Identifier, Length and Data fields. Octets outside the range of the Length field should be treated as Data Link Layer padding and should be ignored on reception.

Data

The Data field is zero or more octets. The format of the Data field is determined by the Code field.


Next: 2.2.1. Authenticate-Request

Connected: An Internet Encyclopedia
2.2. Packet Format

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