Wireless Network Structure v1.3

Translations of this material:

into Russian: Беспроводная сетевая структура версии 1.3. 0% translated in draft.
Submitted for translation by Xomkins 30.10.2010

Text

Wireless Network Structure - v1.3

Simon Mudd

C/Hermanos García Noblejas 5, Esc 1, 2B

Madrid

28037

España/Spain

Joaquín Béjar García

C/Barberán y Collar 22, 1o D

Alcalá de Henares

28805

España/Spain

Ángel Moncada Fernández

Paseo de la Estación 1, 1o C

Alcalá de Henares

28807

España/Spain

$Author: sjmudd $ $Date: 2002/02/23 10:02:31 $ $Revision: 1.4 $

Copyright © 2001 by Simon Mudd y MadridWireless

Copyright © 2002 by Simon Mudd, Ángel Moncada "c4n", Joaquín Béjar

"ShuoData"

Redistribution and use in source (SGML DocBook) and ’compiled’ forms (SGML, HTML, PDF,

PostScript, RTF and so forth) with or without modification, are permitted provided that the following

conditions are met:

1. Redistributions of source code (SGML DocBook) must retain the above

copyright notice, this list of conditions and the following disclaimer as the first

lines of this file unmodified.

2. Redistributions in compiled form (transformed to other DTDs, converted to

PDF, PostScript, RTF and other formats) must reproduce the above copyright

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Wireless Network Structure - v1.3

notice, this list of conditions and the following disclaimer in the

documentation and/or other materials provided with the distribution.

Important: THIS DOCUMENTATION IS PROVIDED BY THE AUTHORS "AS IS" AND ANY EXPRESS OR

IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

This is the Wireless Network Structure Document, a document which tries to give some general

guidelines to groups which are building community wireless networks, enabling them to achieve a

well designed scalable network which will be easy to connect to similar wireless networks

worldwide.

The interest in wireless networks has increased enormously in the last few years, especially since

recently when costs have decreased and the hardware has become more widely available. It is

hoped that a document such as this will help combine the knowledge of those who have experience

with building networks of this type and will avoid problems which may later make a global

Internet of wireless networks difficult to achieve.

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Wireless Network Structure - v1.3

Table of Contents

1. Introduction..............................................................................................................................................................3

2. What is a Wireless Network?..................................................................................................................................4

3. IP Addresses .............................................................................................................................................................4

4. Routing......................................................................................................................................................................8

5. Network Topology ..................................................................................................................................................12

6. Hosts, Domains and DNS ......................................................................................................................................13

7. Addition of a New Node.........................................................................................................................................14

8. Firewalls, Security, QoS, NAT and Routing to the Internet................................................................................16

9. DNS Update Robot.................................................................................................................................................18

10. User Authentication .............................................................................................................................................19

11. Roaming................................................................................................................................................................19

12. Hardware ..............................................................................................................................................................19

13.Wireless Groups ...................................................................................................................................................20

14. Communities.........................................................................................................................................................21

15. References.............................................................................................................................................................21

16. Contributors .........................................................................................................................................................23

1. Introduction

This document tries to give some guidelines about how to build a community wireless network. It explains the

structure of the different wireless networks, how the nodes and clients are connected and how the IP traffic is routed

between the different nodes organised by an individual or a group. Taking into account that the different wireless

groups are working towards a common goal, to setup a wireless networks in various place throughout the world, this

document also tries to give information about how the different groups could connect together or how they could

connect to the Internet.

This document can not hope to answer all the questions related to building a community wireless network, but it does

attempt to cover some of the more practical aspects which will be common to any group considering starting a

project of this type. Most of these considerations if treated or at least considered at the beginning of a project can

avoid mistakes which are difficult to rectify later. It is clear to us at the moment that there is an important interest in

this subject, and that even if the growth of some of the current projects is less than their core members expect, that

there is still a potential for creating extremely large networks, each of which will requiring some careful coordination

to work effectively.

The use of common standards and network structures greatly simplifies the tasks needed to interconnect the wireless

networks and also minimises the management effort which is common to each network.

Feedback and comments about how to improve this document are always welcome, so don’t be shy. If you know

more about this subject than I do help me out and get your name down in the list of credits.

I wrote the original version of this document in Spanish. Seeing that there might be a wider potential audience if the

document where written in English I translated the Spanish version. As English is my native tongue and it is difficult

to maintain a document in several languages further changes to this document will be made in English.

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Wireless Network Structure - v1.3

The latest version of this document can be found at http://www.pobox.com/~sjmudd/wireless/network-structure/

(http://www.pobox.com/~sjmudd/wireless/network-structure/). I will also add pointers to the latest version in

Spanish.

2. What is a Wireless Network?

A wireless network as described in this document is a network of wireless local area networks (LAN) connected

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