Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

The whole site in one document for easy reference!
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Network Interface Layer (OSI Data Link Layer) Protocols
           9  TCP/IP Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol (PPP)
                9  Point-to-Point Protocol (PPP)

Previous Topic/Section
PPP Bandwidth Allocation Protocol (BAP) and Bandwidth Allocation Control Protocol (BACP)
Previous Page
Pages in Current Topic/Section
1
Next Page
PPP General Frame Format
Next Topic/Section

PPP Protocol Frame Formats

The 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, it also helps make more clear how the key PPP protocols function.

In this section I illustrate the most common frame formats used for sending both data and control information over PPP. I begin with an explanation of the overall format used for all PPP frames. I also describe the general format used for the various control protocols and the option format that most of them use. (One of the nice things about PPP is that so many of the protocols use control frames with a common format.)

I then specifically list the frames used for the Link Control Protocol (LCP) and the authentication protocols (PAP and CHAP). I also describe the special format used by the PPP Multilink Protocol (MP) to transport fragments of data over bundled links.

Note: Due to the sheer number of different protocols in PPP (dozens) and the fact that many have their own unique options, I cannot describe all the specific frame formats and option formats for every protocol in detail here. Please refer to the appropriate RFCs (shown in the topic on PPP standards) if you need more detail than provided in this section.


Quick navigation to subsections and regular topics in this section



Previous Topic/Section
PPP Bandwidth Allocation Protocol (BAP) and Bandwidth Allocation Control Protocol (BACP)
Previous Page
Pages in Current Topic/Section
1
Next Page
PPP General Frame Format
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.