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Open Networks When Users Create a Network ������������� ��������������������������� ���������������� ������������ ��������������������� ������������� ���������������� ����������������������������������� ����������������������������������� ������������������������������������ ��������������������������������� ������������������������������������� ����������������������������������� �������������������������������� ������������������������������������ ������������������������������������� ������������������������������� ���������������������������������� ��������������������������������� ������������������������������������ ���������������������������������� ������������������������������������ ������������������������������������ ������������������������������ ������������������ ����������������������� ������������������ ����������������������� ����������������������������� ������������������������������������ �������������������� ���������������������������� ����������������������������������������������������������������������������������������������������������������������������� ������������������������������������������������������������������������������������������������������������������������������ �������������������������������������������������������������������������������������������������������������������������������� �������� Preface Software has become a strategic societal resource in the last few decades. e emergence of Free Software, which has entered in major sectors of the ICT market, is drastically changing the economics of software development and usage. Free Software – sometimes also referred to as “Open Source” or “Libre Software” – can be used, studied, copied, modified and distributed freely. It offers the freedom to learn and to teach without engaging in dependencies on any single technology provider. ese freedoms are considered a fundamental precondition for sustainable development and an inclusive information society. Although there is a growing interest in free technologies (Free Software and Open Standards), still a limited number of people have sufficient knowledge and expertise in these fields. e FTA attempts to respond to this demand. Introduction to the FTA e Free Technology Academy (FTA) is a joint initiative from several educational institutes in various countries. It aims to contribute to a society that permits all users to study, participate and build upon existing knowledge without restrictions. What does the FTA offer? e Academy offers an online master level programme with course modules about Free Technologies. Learners can choose to enrol in an individual course or register for the whole programme. Tuition takes place online in the FTA virtual campus and is performed by teaching staff from the partner universities. Credits obtained in the FTA programme are recognised by these universities. Who is behind the FTA? e FTA was initiated in 2008 supported by the Life Long Learning Programme (LLP) of the European Commission, under the coordination of the Free Knowledge Institute and in partnership with three european universities: Open Universiteit Nederland (e Netherlands), Universitat Oberta de Catalunya (Spain) and University of Agder (Norway). For who is the FTA? e Free Technology Academy is specially oriented to IT professionals, educators, students and decision makers. What about the licensing? All learning materials used in and developed by the FTA are Open Educational Resources, published under copyleft free licenses that allow them to be freely used, modified and redistributed. Similarly, the software used in the FTA virtual campus is Free Software and is built upon an Open Standards framework. Evolution of this book e FTA has reused existing course materials from the Universitat Oberta de Catalunya and that had been developed together with LibreSoft staff from the Universidad Rey Juan Carlos. In 2008 this book was translated into English with the help of the SELF (Science, Education and Learning in Freedom) Project, supported by the European Commission's Sixth Framework Programme. In 2009, this material has been improved by the Free Technology Academy. Additionally the FTA has developed a study guide and learning activities which are available for learners enrolled in the FTA Campus. Participation Users of FTA learning materials are encouraged to provide feedback and make suggestions for improvement. A specific space for this feedback is set up on the FTA website. ese inputs will be taken into account for next versions. Moreover, the FTA welcomes anyone to use and distribute this material as well as to make new versions and translations. See for specific and updated information about the book, including translations and other formats: http://ftacademy.org/materials/fsm/1. For more information and enrolment in the FTA online course programme, please visit the Academy's website: http://ftacademy.org/. I sincerely hope this course book helps you in your personal learning process and helps you to help others in theirs. I look forward to see you in the free knowledge and free technology movements! Happy learning! Wouter Tebbens President of the Free Knowledge Institute Director of the Free technology Academy Acknowledgenments e authors wish to thank the Fundació per a la Universitat Oberta de Catalunya (http://www.uoc.edu) for financing the first edition of this work under the framework of the International Master's degree in Free Software offered by this institution. e current version of these materials in English has been extended with the funding of the Free Technology Academy (FTA) project. e FTA project has been funded with support from the European Commission (reference no. 142706- LLP-1-2008-1-NL-ERASMUS- EVC of the Lifelong Learning Programme). is publication reflects the views only of the authors, and the Commission cannot be held responsible for any use which may be made of the information contained therein. ��������������������� � ������������� �������� �������� ������������� ���������������� �� �������������������������������������������� �� ������������������������������������������ �� ������������������������� �� ������������ Open networks When users create a network Enric Peig Olivé PID_00164585 GNUFDL • PID_00164585 Open networks Copyright © 2010, FUOC. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License" GNUFDL • PID_00164585 Open networks Index 1. Internet protocols: IP, TCP and applications............................. 5 1.1. Network: IP (Internet Protocol) .................................................. 6 1.1.1. IP Addresses ................................................................... 7 1.1.2. IP packet format ............................................................ 7 1.1.3. Routing and routers ....................................................... 8 1.2. Transport: TCP and UDP ............................................................ 9 1.2.1. UDP ................................................................................ 10 1.2.2. TCP ................................................................................. 12 1.3. Applications: WWW, e-mail, p2p... ............................................ 14 1.3.1. Client/server applications .............................................. 15 1.3.2. p2p applications ............................................................ 17 2. Open networks. When users create a network.......................... 18 2.1. Routing layouts ........................................................................... 20 2.1.1. Routing ........................................................................... 21 2.2. Wireless networks ........................................................................ 22 2.2.1. Wireless sensor networks ............................................... 23 2.2.2. Access points .................................................................. 24 2.2.3. Firmware ........................................................................ 24 2.3. Basics on wireless network security ............................................ 25 2.3.1. WEP ................................................................................ 25 2.3.2. WPA/WPA2 .................................................................... 27 3. Audio and video streaming............................................................. 29 3.1. Audio and video on a packet-based network ............................. 29 3.1.1. Strategies beyond TCP ................................................... 31 3.2. Real Time Streaming Protocol (RTSP) ......................................... 32 3.2.1. RTSP commands ............................................................ 33 3.2.2. States diagram ................................................................ 33 3.2.3. Description of the protocol ........................................... 34 3.3. Content delivery networks ......................................................... 36 3.4. Examples of streaming servers and clients ................................. 37 4. IP telephony........................................................................................ 38 4.1. Architecture and protocols ......................................................... 39 4.1.1. H.323 .............................................................................
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