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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—Hubert H. Humphrey (19111978)