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TCP/IP Guide by Charles M. Kozierok

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Chapter 12. PPP PROTOCOL FRAME FORMATS

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The Point-to-Point Protocol (PPP) protocol suite includes a number of different protocols used to send both data and control information in different ways. Each of these packages information into messages called frames, each of which follows a particular frame format. PPP starts with a general frame format that encompasses all frames sent on the link and then includes more specific formats for different purposes. Understanding these formats not only makes diagnosing PPP issues easier, but also helps make more clear how the key PPP protocols function.

In this chapter, I illustrate the most common frame formats ...

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