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<title>Setting which addresses and ports Apache uses</title>
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<h1 align="CENTER">Setting which addresses and ports Apache
uses</h1>
<p>When Apache starts, it connects to some port and address on
the local machine and waits for incoming requests. By default,
it listens to all addresses on the machine, and to the port as
specified by the <code>Port</code> directive in the server
configuration. However, it can be told to listen to more the
one port, or to listen to 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>Listen</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>Listen</code> directive, the server
listens to the given port on all interfaces, instead of the
port given by the <code>Port</code> directive. 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 to. 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>
<pre>
Listen 80
Listen 8000
</pre>
To make the server accept connections on two specified
interfaces and port numbers, use
<pre>
Listen 192.170.2.1:80
Listen 192.170.2.5:8000
</pre>
<h2>How this works with Virtual Hosts</h2>
<p>Listen does not implement Virtual Hosts. It only tells the
main server what addresses and ports to listen to. If no
<VirtualHost> directives are used, the server will behave
the same for all accepted requests. However,
<VirtualHost> 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 <VirtualHost> section
should be created for a specified address and port to set the
behavior of this virtual host. Note that if the
<VirtualHost> is set for an address and port that the
server is not listening to, it cannot be accessed.</p>
<h2>See also</h2>
See also the documentation on <a
href="vhosts/">Virtual Hosts</a>, <a
section</a>. <!--#include virtual="footer.html" -->
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