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<?xml version="1.0" encoding="ISO-8859-1"?>
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<title>Binding - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.1</p>
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<p>Configuring Apache to listen on specific addresses and ports.</p>
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<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>
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<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>
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<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>On the other hand, on some platforms such as Linux and Tru64 the
<strong>only</strong> way to handle both IPv6 and IPv4 is to use
mapped addresses. 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.</p>
<p><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 your platform supports it and 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. <code>--disable-v4-mapped</code> is the default on FreeBSD,
NetBSD, and OpenBSD.</p>
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<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>
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