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<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --> <title>Binding - Apache HTTP Server</title> <link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> <link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> <link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /> <link href="./images/favicon.ico" rel="shortcut icon" /></head> <body id="manual-page"><div id="page-header"> <p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p> <p class="apache">Apache HTTP Server Version 2.0</p> <img alt="" src="./images/feather.gif" /></div> <div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div> <div id="path"> <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="./">Version 2.0</a></div><div id="page-content"><div id="preamble"><h1>Binding</h1> <div class="toplang"> <p><span>Available Languages: </span><a href="./en/bind.html" title="English"> en </a> | <a href="./ja/bind.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | <a href="./ko/bind.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> </div> <p>Configuring Apache to listen on specific addresses and ports.</p> </div> <div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#overview">Overview</a></li> <li><img alt="" src="./images/down.gif" /> <a href="#ipv6">Special IPv6 Considerations</a></li> <li><img alt="" src="./images/down.gif" /> <a href="#virtualhost">How This Works With Virtual Hosts</a></li> </ul><h3>See also</h3><ul class="seealso"><li><a href="vhosts/">Virtual Hosts</a></li><li><a href="dns-caveats.html">DNS Issues</a></li></ul></div> <div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> <div class="section"> <h2><a name="overview" id="overview">Overview</a></h2> <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/core.html">core</a></code></li><li><code class="module"><a href="./mod/mpm_common.html">mpm_common</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code></li><li><code class="directive"><a href="./mod/mpm_common.html#listen">Listen</a></code></li></ul></td></tr></table> <p>When Apache starts, it binds to some port and address on the local machine and waits for incoming requests. By default, it listens to all addresses on the machine. However, it needs to be told to listen on specific ports, or to listen on only selected addresses, or a combination. This is often combined with the Virtual Host feature which determines how Apache responds to different IP addresses, hostnames and ports.</p> <p>The <code class="directive"><a href="./mod/mpm_common.html#listen">Listen</a></code> directive tells the server to accept incoming requests only on the specified port or address-and-port combinations. If only a port number is specified in the <code class="directive"><a href="./mod/mpm_common.html#listen">Listen</a></code> directive, the server listens to the given port on all interfaces. If an IP address is given as well as a port, the server will listen on the given port and interface. Multiple Listen directives may be used to specify a number of addresses and ports to listen on. The server will respond to requests from any of the listed addresses and ports.</p> <p>For example, to make the server accept connections on both port 80 and port 8000, use:</p> <div class="example"><p><code> Listen 80<br /> Listen 8000 </code></p></div> <p>To make the server accept connections on two specified interfaces and port numbers, use</p> <div class="example"><p><code> Listen 192.170.2.1:80<br /> Listen 192.170.2.5:8000 </code></p></div> <p>IPv6 addresses must be surrounded in square brackets, as in the following example:</p> <div class="example"><p><code> Listen [fe80::a00:20ff:fea7:ccea]:80 </code></p></div> </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> <div class="section"> <h2><a name="ipv6" id="ipv6">Special IPv6 Considerations</a></h2> <p>A growing number of platforms implement IPv6, and APR supports IPv6 on most of these platforms, allowing Apache to allocate IPv6 sockets and handle requests which were sent over IPv6.</p> <p>One complicating factor for Apache administrators is whether or not an IPv6 socket can handle both IPv4 connections and IPv6 connections. Handling IPv4 connections with an IPv6 socket uses IPv4-mapped IPv6 addresses, which are allowed by default on most platforms but are disallowed by default on FreeBSD, NetBSD, and OpenBSD in order to match the system-wide policy on those platforms. But even on systems where it is disallowed by default, a special configure parameter can change this behavior for Apache.</p> <p>If you want Apache to handle IPv4 and IPv6 connections with a minimum of sockets, which requires using IPv4-mapped IPv6 addresses, specify the <code>--enable-v4-mapped</code> configure option and use generic Listen directives like the following:</p> <div class="example"><p><code> Listen 80 </code></p></div> <p>With <code>--enable-v4-mapped</code>, the Listen directives in the default configuration file created by Apache will use this form. <code>--enable-v4-mapped</code> is the default on all platforms but FreeBSD, NetBSD, and OpenBSD, so this is probably how your Apache was built.</p> <p>If you want Apache to handle IPv4 connections only, regardless of what your platform and APR will support, specify an IPv4 address on all Listen directives, as in the following examples:</p> <div class="example"><p><code> Listen 0.0.0.0:80<br /> Listen 192.170.2.1:80 </code></p></div> <p>If you want Apache to handle IPv4 and IPv6 connections on separate sockets (i.e., to disable IPv4-mapped addresses), specify the <code>--disable-v4-mapped</code> configure option and use specific Listen directives like the following:</p> <div class="example"><p><code> Listen [::]:80<br /> Listen 0.0.0.0:80 </code></p></div> <p>With <code>--disable-v4-mapped</code>, the Listen directives in the default configuration file created by Apache will use this form. <code>--disable-v4-mapped</code> is the default on FreeBSD, NetBSD, and OpenBSD.</p> </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div> <div class="section"> <h2><a name="virtualhost" id="virtualhost">How This Works With Virtual Hosts</a></h2> <p>Listen does not implement Virtual Hosts. It only tells the main server what addresses and ports to listen to. If no <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code> directives are used, the server will behave the same for all accepted requests. However, <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code> can be used to specify a different behavior for one or more of the addresses and ports. To implement a VirtualHost, the server must first be told to listen to the address and port to be used. Then a <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code> section should be created for a specified address and port to set the behavior of this virtual host. Note that if the <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code> is set for an address and port that the server is not listening to, it cannot be accessed.</p> </div></div> <div class="bottomlang"> <p><span>Available Languages: </span><a href="./en/bind.html" title="English"> en </a> | <a href="./ja/bind.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | <a href="./ko/bind.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> </div><div id="footer"> <p class="apache">Copyright 1999-2004 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p> <p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p></div> </body></html>