<HTML ><HEAD ><TITLE >Introduction</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="Linux PPP HOWTO" HREF="index.html"><LINK REL="PREVIOUS" TITLE="How can I help?" HREF="c28.html"><LINK REL="NEXT" TITLE="Clients and Servers" HREF="x52.html"></HEAD ><BODY CLASS="CHAPTER" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" ><A HREF="http://www.linuxports.com/howto/ppp" TARGET="_top" >Linux PPP HOWTO</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="c28.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="x52.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="AEN44">Chapter 2. Introduction</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT >2.1. <A HREF="x52.html" >Clients and Servers</A ></DT ><DT >2.2. <A HREF="x71.html" >Differences between Linux distributions</A ></DT ><DT >2.3. <A HREF="x100.html" >PPP configuration tools</A ></DT ></DL ></DIV ><P >PPP (the Point to Point Protocol) is a mechanism for creating and running IP (the Internet Protocol) and other network protocols over a serial link - be that a direct serial connection (using a null-modem cable), over a telnet established link, or a link made using modems and telephone lines (and of course using digital lines such as ISDN).</P ><P >Using PPP, you can connect your Linux PC to a PPP server and access the resources of the network to which the server is connected (almost) as if you were directly connected to that network.</P ><P >You can also set up your Linux PC as a PPP server, so that other computers can dial into your computer and access the resources on your local PC and/or network.</P ><P >As PPP is a peer-to-peer system, you can also use PPP on two Linux PCs to link together two networks (or a local network to the Internet), creating a Wide Area Network (WAN).</P ><P >One major difference between serial based PPP and an Ethernet connection is of course speed - a standard Ethernet connection operates at 10 Mbs (Mega - million bits per second) or 100 Mbs maximum theoretical throughput, whereas an analogue modem operates at speeds up to 56 kbps (kilo - thousand bits per second).</P ><P >Also, depending on the type of PPP connection, there may be some limitations in usage of some applications and services.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="c28.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="x52.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >How can I help?</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Clients and Servers</TD ></TR ></TABLE ></DIV ></BODY ></HTML >