Point-to-point Protocol - PPP Frame - Structure of A PPP Frame

Structure of A PPP Frame

Name Number of bytes Description
Protocol 1 or 2 setting of protocol in data field
Information variable (0 or more) datagram
Padding variable (0 or more) optional padding

The Protocol field indicates the type of payload packet (e.g. LCP, NCP, IP, IPX, AppleTalk, etc.).

The Information field contains the PPP payload; it has a variable length with a negotiated maximum called the Maximum Transmission Unit. By default, the maximum is 1500 octets. It might be padded on transmission; if the information for a particular protocol can be padded, that protocol must allow information to be distinguished from padding.

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