datagram
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... datagram ...
... layer (such as IP).
A datagram may be encapsulated in one or more packets
passed to the data link layer ...
... PPP encapsulation is used to disambiguate multiprotocol
datagrams. This encapsulation requires framing to indicate the
beginning and end of the encapsulation ...
... The Protocol field is one or two octets, and its value identifies
the datagram encapsulated in the Information field of the packet.
The field is transmitted and received most significant octet
...
...
The Information field is zero or more octets. The Information
field contains the datagram for the protocol specified in the
Protocol field.
...
... network-layer protocols. Once each of the chosen network-layer
protocols has been configured, datagrams from each network-layer
protocol can be sent over the link ...