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diff --git a/slackbook/html/network-configuration-wireless.html b/slackbook/html/network-configuration-wireless.html new file mode 100644 index 00000000..fa86dcc2 --- /dev/null +++ b/slackbook/html/network-configuration-wireless.html @@ -0,0 +1,208 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" + "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml"> +<head> +<meta name="generator" content="HTML Tidy, see www.w3.org" /> +<title>Wireless</title> +<meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" /> +<link rel="HOME" title="Slackware Linux Essentials" href="index.html" /> +<link rel="UP" title="Network Configuration" href="network-configuration.html" /> +<link rel="PREVIOUS" title="PPP" href="network-configuration-ppp.html" /> +<link rel="NEXT" title="Network File Systems" href="network-configuration-nfs.html" /> +<link rel="STYLESHEET" type="text/css" href="docbook.css" /> +<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> +</head> +<body class="SECT1" 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">Slackware Linux Essentials</th> +</tr> + +<tr> +<td width="10%" align="left" valign="bottom"><a href="network-configuration-ppp.html" +accesskey="P">Prev</a></td> +<td width="80%" align="center" valign="bottom">Chapter 5 Network Configuration</td> +<td width="10%" align="right" valign="bottom"><a href="network-configuration-nfs.html" +accesskey="N">Next</a></td> +</tr> +</table> + +<hr align="LEFT" width="100%" /> +</div> + +<div class="SECT1"> +<h1 class="SECT1"><a id="NETWORK-CONFIGURATION-WIRELESS" +name="NETWORK-CONFIGURATION-WIRELESS">5.5 Wireless</a></h1> + +<p>Wireless networking is still a relatively new thing in the world of computers, yet is +quickly catching on as more people begin to purchase laptops and want networking on the +go, without having to fool with some old twisted pair cable. This trend doesn't appear to +be slowing down. Unfortunately, wireless networking isn't yet as strongly supported in +Linux as traditional wired networking.</p> + +<p>There are three basic steps to configuring an 802.11 wireless Ethernet card:</p> + +<ol type="1"> +<li> +<p>Hardware support for the wireless card</p> +</li> + +<li> +<p>Configure the card to connect to a wireless access point</p> +</li> + +<li> +<p>Configure the network</p> +</li> +</ol> + +<div class="SECT2"> +<h2 class="SECT2"><a id="AEN2033" name="AEN2033">5.5.1 Hardware Support</a></h2> + +<p>Hardware support for a wireless card is provided through the kernel, either with a +module or built in to the kernel. Generally, most newer Ethernet cards are provided +through kernel modules, so you'll want to determine the appropriate kernel module and +load it through <tt class="FILENAME">/etc/rc.d/rc.modules</tt>. <tt +class="COMMAND">netconfig</tt> may not detect your wireless card, so you'll probably need +to determine the card yourself. See <a +href="http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/" +target="_top">http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/</a> for more +information on kernel drivers for various wireless cards.</p> +</div> + +<div class="SECT2"> +<h2 class="SECT2"><a id="AEN2044" name="AEN2044">5.5.2 Configure the Wireless +Settings</a></h2> + +<p>The vast majority of this work is done by <tt class="COMMAND">iwconfig</tt>, so as +always read the man page for <tt class="COMMAND">iwconfig</tt> if you need more +information.</p> + +<p>First, you'll want to configure your wireless access point. Wireless access points +vary quite a bit in their terminology, and how to configure them, so you may need to +adjust a bit to accommodate your hardware. In general, you'll need at least the following +information:</p> + +<ul> +<li> +<p>The domain ID, or name of the network (called the ESSID by <tt +class="COMMAND">iwconfig</tt>)</p> +</li> + +<li> +<p>The channel the WAP uses</p> +</li> + +<li> +<p>The encryption settings, including any keys used (preferably in hexadecimal)</p> +</li> +</ul> + +<div class="WARNING"> +<table class="WARNING" width="100%" border="0"> +<tr> +<td width="25" align="CENTER" valign="TOP"><img src="./imagelib/admon/warning.png" +hspace="5" alt="Warning" /></td> +<td align="LEFT" valign="TOP"> +<p>A NOTE ABOUT WEP. WEP is quit flawed, but it's much better than nothing. If you wish a +greater degree of security on your wireless network, you should investigate VPNs or +IPSec, both of which are beyond the scope of this document. You might also configure your +WAP not to advertise its domain ID/ ESSID. A thorough discussion of wireless policy is +beyond the scope of this section, but a quick Google search will turn up more than you +ever wanted to know.</p> +</td> +</tr> +</table> +</div> + +<p>Once you've gathered the above information, and assuming you've used <tt +class="COMMAND">modprobe</tt> to load the appropriate kernel driver, you can edit <tt +class="FILENAME">rc.wireless.conf</tt> and add your settings. The <tt +class="FILENAME">rc.wireless.conf</tt> file is a bit untidy. The least effort is to +modify the generic section with your ESSID and KEY, and CHANNEL if required by your card. +(Try not setting CHANNEL, and if it works, great; if not, set the CHANNEL as +appropriate.) If you're daring, you can modify the file so that only the necessary +variables are set. The variable names in <tt class="FILENAME">rc.wireless.conf</tt> +correspond to the <tt class="COMMAND">iwconfig</tt> parameters, and are read by <tt +class="FILENAME">rc.wireless</tt> and used in the appropriate <tt +class="COMMAND">iwconfig</tt> commands.</p> + +<p>If you have your key in hexadecimal, that's ideal, since you can be fairly confident +that your WAP and <tt class="COMMAND">iwconfig</tt> will agree on the key. If you only +have a string, you can't be sure how your WAP will translate that into a hexadecimal key, +so some guesswork may be needed (or get your WAP's key in hex).</p> + +<p>Once you've modified <tt class="FILENAME">rc.wireless.conf</tt>, run <tt +class="FILENAME">rc.wireless</tt> as <tt class="USERNAME">root</tt>, then run <tt +class="FILENAME">rc.inet1</tt>, again as <tt class="USERNAME">root</tt>. You can test +your wireless networking with standard testing tools such as <tt +class="COMMAND">ping</tt>, along with <tt class="COMMAND">iwconfig</tt>. If you have a +wired interface you may wish to use <tt class="COMMAND">ifconfig</tt> to turn those +interfaces off while you test your wireless networking to ensure there's no interference. +You may also want to test your changes through a reboot.</p> + +<p>Now that you've seen how to edit <tt class="FILENAME">/etc/rc.d/rc.wireless</tt> for +you default network, let's take a closer look at iwconfig and see how it all works. This +will teach you the quick and dirty way of setting up wifi for those times when you find +yourself at an Internet cafe, coffee shop, or any other wifi hot spot and wish to get +online.</p> + +<p>The first step is to tell your wireless NIC what network to join. Make sure you +replace “<tt class="FILENAME">eth0</tt>” with whatever network interface your +wireless card uses and change “<var class="REPLACEABLE">mynetwork</var>” to +the essid you wish to use. Yes, we know you're smarter than that. Next you'll have to +specify the encryption key (if any) used on your wireless network. Finally specify the +channel to use (if needed).</p> + +<table border="0" bgcolor="#E0E0E0" width="100%"> +<tr> +<td> +<pre class="SCREEN"> +<samp class="PROMPT">#</samp> <kbd class="USERINPUT">iwconfig eth0 essid "<var +class="REPLACEABLE">mynetwork</var>"</kbd> +<samp class="PROMPT">#</samp> <kbd class="USERINPUT">iwconfig eth0 key <var +class="REPLACEABLE">XXXXXXXXXXXXXXXXXXXXXXXXXXX</var></kbd> +<samp class="PROMPT">#</samp> <kbd class="USERINPUT">iwconfig eth0 channel n</kbd> +</pre> +</td> +</tr> +</table> + +<p>That should be all on the wireless end of things.</p> +</div> + +<div class="SECT2"> +<h2 class="SECT2"><a id="AEN2101" name="AEN2101">5.5.3 Configure the Network</a></h2> + +<p>This is done in the exact same way as wired networks. Simply refer to earlier sections +of this chapter.</p> +</div> +</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="network-configuration-ppp.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="network-configuration-nfs.html" +accesskey="N">Next</a></td> +</tr> + +<tr> +<td width="33%" align="left" valign="top">PPP</td> +<td width="34%" align="center" valign="top"><a href="network-configuration.html" +accesskey="U">Up</a></td> +<td width="33%" align="right" valign="top">Network File Systems</td> +</tr> +</table> +</div> +</body> +</html> + |