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.
Read more about this topic: Point-to-point Protocol, PPP Frame
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