PPP General Control Protocol Frame Format and Option Format
The general frame format you just saw is used for all of the many frame types defined in the PPP protocol suite. Within that format, the Information field carries either encapsulated layer 3 user data or encapsulated control messages. These control messages contain specific information that is used to configure, manage, and discontinue PPP links, and to implement the various features that comprise PPP.
There are many different PPP control protocols that usually can be distinguished by the word Control appearing their names. These include the main PPP Link Control Protocol (LCP); a family of Network Control Protocols (NCPs) such as IPCP, IPXCP, and so forth; and also control protocols for ...
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