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Network Administration with FreeBSD 7 by Babak Farrokhi

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Chapter 9. Network Configuration—PPP

Point-to-Point Protocol (PPP) is a layer2 protocol used to encapsulate layer3 traffic (that is IP) over a point-to-point physical medium, such as an asynchronous serial interface. PPP was introduced in 1989 based on HDLC protocol and was extended subsequently, based on the need to support more protocols and extensions. The latest standard (RFC 1661) was updated in 1994. Numerous extensions have become available for the protocol since then, including authentication, compression, and control protocols as well as some vendor-specific extensions.

FreeBSD 7 supports PPP protocol in the base system (which means no third-party software should be installed for normal usage).

There are two implementations of PPP stack ...

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