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110 lines
4.1 KiB
HTML
110 lines
4.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<html><head>
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<title>Setting which addresses and ports Apache uses</title>
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</head>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<h1 ALIGN="CENTER">Setting which addresses and ports Apache uses</h1>
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<hr>
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When Apache starts, it connects to some port and address on the
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local machine and waits for incoming requests. By default, it
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listens to all addresses on the machine, and to the port
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as specified by the <tt>Port</tt> directive in the server configuration.
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However, it can be told to listen to more the one port, or to listen
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to only selected addresses, or a combination. This is often combined
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with the Virtual Host feature which determines how Apache
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responds to different IP addresses, hostnames and ports.<p>
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There are two directives used to restrict or specify which addresses
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and ports Apache listens to.
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<ul>
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<li><a href="#bindaddress">BindAddress</a> is used to restrict the server to listening to
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a single address, and can be used to permit multiple Apache servers
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on the same machine listening to different IP addresses.
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<li><a href="#listen">Listen</a> can be used to make a single Apache server listen
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to more than one address and/or port.
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</ul>
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<h3><a name="bindaddress">BindAddress</a></h3>
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<strong>Syntax:</strong> BindAddress <em>[ * | IP-address | hostname ]</em><br>
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<strong>Default:</strong> <code>BindAddress *</code><br>
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<strong>Context:</strong> server config<br>
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<strong>Status:</strong> Core<p>
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Makes the server listen to just the specified address. If the argument
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is *, the server listens to all addresses. The port listened to
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is set with the <tt>Port</tt> directive. Only one BindAddress
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should be used.
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<h3><a name="listen">Listen</a></h3>
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<strong>Syntax:</strong> Listen <em>[ port | IP-address:port ]</em><br>
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<strong>Default:</strong> <code>none</code><br>
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<strong>Context:</strong> server config<br>
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<strong>Status:</strong> Core<p>
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<tt>Listen</tt> can be used instead of <tt>BindAddress</tt> and
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<tt>Port</tt>. It tells the server to accept incoming requests on the
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specified port or address-and-port combination. If the first format is
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used, with a port number only, the server listens to the given port on
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all interfaces, instead of the port given by the <tt>Port</tt>
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directive. If an IP address is given as well as a port, the server
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will listen on the given port and interface. <p> Multiple Listen
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directives may be used to specify a number of addresses and ports to
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listen to. The server will respond to requests from any of the listed
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addresses and ports.<p>
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For example, to make the server accept connections on both port
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80 and port 8000, use:
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<pre>
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Listen 80
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Listen 8000
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</pre>
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To make the server accept connections on two specified
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interfaces and port numbers, use
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<pre>
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Listen 192.170.2.1:80
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Listen 192.170.2.5:8000
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</pre>
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<h2>How this works with Virtual Hosts</h2>
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BindAddress and Listen do not implement Virtual Hosts. They tell the
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main server what addresses and ports to listen to. If no
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<VirtualHost> directives are used, the server will behave the
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same for all accepted requests. However, <VirtualHost> can be
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used to specify a different behavior for one or more of the addresses
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and ports. To implement a VirtualHost, the server must first be told
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to listen to the address and port to be used. Then a
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<VirtualHost> section should be created for a specified address
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and port to set the behavior of this virtual host. Note that if the
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<VirtualHost> is set for an address and port that the server is
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not listening to, it cannot be accessed.
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<h2>See also</h2>
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See also the documentation on
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<a href="virtual-host.html">Virtual Hosts</a>,
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<a href="host.html">Non-IP virtual hosts</a>,
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<a href="mod/core.html#bindaddress">BindAddress directive</a>,
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<a href="mod/core.html#port">Port directive</a>,
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<a href="dns-caveats.html">DNS Issues</a>
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and
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<a href="mod/core.html#virtualhost"><VirtualHost> section</a>.
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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