* Update transformation

    <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 

    it listens to all addresses on the machine.  However, it may need to

    be told to listen on specific ports, or only on selected 

    addresses, or a combination of both. 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

    incoming requests only on the specified ports 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

    addresses and ports.</p>

    <p>For example, to make the server accept connections on both

    port 80 and port 8000, use:</p>

    port 80 and port 8000, on all interfaces, 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>

    <p>To make the server accept connections on port 80 for one interface,

       and port 8080 on another, 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

    <p>IPv6 addresses must be enclosed in square brackets, as in the

    following example:</p>

    <div class="example"><p><code>

    <p>A growing number of platforms implement IPv6, and

    <a class="glossarylink" href="./glossary.html#apr" title="see glossary">APR</a> supports IPv6 on most of these platforms,

    allowing Apache to allocate IPv6 sockets and handle requests which

    were sent over IPv6.</p>

    allowing Apache to allocate IPv6 sockets, and to handle requests 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 

    platforms, but are disallowed by default on FreeBSD, NetBSD, and 

    OpenBSD, in order to match the system-wide policy on those

    platforms. On systems where it is disallowed by default, a 

    special <code class="program"><a href="./programs/configure.html">configure</a></code> parameter can change this behavior

    for Apache.</p>

    <p>On the other hand, on some platforms such as Linux and Tru64 the 

    <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> <code class="program"><a href="./programs/configure.html">configure</a></code> option.</p>

    <p><code>--enable-v4-mapped</code> is the default on all platforms but 

    <p><code>--enable-v4-mapped</code> is the default on all platforms except 

    FreeBSD, NetBSD, and OpenBSD, so this is probably how your Apache was 

    built.</p>

<h2><a name="virtualhost" id="virtualhost">How This Works With Virtual Hosts</a></h2>

    <p> <code class="directive"><a href="./mod/mpm_common.html#listen">Listen</a></code> does not implement 

    Virtual Hosts. It only tells the

    main server what addresses and ports to listen to. If no

    <p> The <code class="directive"><a href="./mod/mpm_common.html#listen">Listen</a></code> directive does not implement 

    Virtual Hosts - it only tells the

    main server what addresses and ports to listen on. If no

    <code class="directive"><a href="./mod/core.html#virtualhost">&lt;VirtualHost&gt;</a></code>

    directives are used, the server will behave

    the same for all accepted requests. However,

    in the same way for all accepted requests. However,

    <code class="directive"><a href="./mod/core.html#virtualhost">&lt;VirtualHost&gt;</a></code>

    can be used to specify a different behavior

    for one or more of the addresses and ports. To implement a

    for one or more of the addresses or 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">&lt;VirtualHost&gt;</a></code> section

    should be created for a specified address and port to set the

    should be created for the 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">&lt;VirtualHost&gt;</a></code>

    is set for an address and port that the

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