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 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)                      9  PPP Feature Protocols

PPP Encryption Control Protocol (ECP) and Encryption Algorithms 1 2 3 PPP Bandwidth Allocation Protocol (BAP) and Bandwidth Allocation Control Protocol (BACP)

PPP Multilink Protocol Architecture

MP is an optional feature of PPP, so it must be designed to integrate seamlessly into regular PPP operation. To accomplish this, MP is implemented as a new architectural “sublayer” within PPP. In essence, an MP sublayer is inserted between the “regular” PPP mechanism and any network layer protocols using PPP, as shown in Figure 31. This allows MP to take all network layer data to be sent over the PPP link and spread it over multiple physical connections, without causing either the normal PPP mechanisms or the network layer protocol interfaces to PPP to “break”.

PPP Encryption Control Protocol (ECP) and Encryption Algorithms 1 2 3 PPP Bandwidth Allocation Protocol (BAP) and Bandwidth Allocation Control Protocol (BACP)