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</style><title>18. The ipliteral router</title><meta name="generator" content="DocBook XSL Stylesheets V1.72.0" /><link rel="start" href="index.html" title="Specification of the Exim Mail Transfer Agent" /><link rel="up" href="index.html" title="Specification of the Exim Mail Transfer Agent" /><link rel="prev" href="ch17.html" title="17. The dnslookup router" /><link rel="next" href="ch19.html" title="19. The iplookup router" /></head><body><div class="navheader">
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<h2 class="title"><a href="index.html#toc0192" id="CHID5">18. The ipliteral router</a></h2></div></div>
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<p>
<a id="id569225" class="indexterm"></a>
<a id="id569240" class="indexterm"></a>
<a id="id569255" class="indexterm"></a>
This router has no private options. Unless it is being used purely for
verification (see <span><strong class="option">verify_only</strong></span>) a transport is required to be defined by the
generic <span><strong class="option">transport</strong></span> option. The router accepts the address if its domain part
takes the form of an RFC 2822 domain literal. For example, the <span><strong class="command">ipliteral</strong></span>
router handles the address
</p>
<pre class="literallayout">root@[192.168.1.1]
</pre><p>
by setting up delivery to the host with that IP address. IPv4 domain literals
consist of an IPv4 address enclosed in square brackets. IPv6 domain literals
are similar, but the address is preceded by <code class="literal">ipv6:</code>. For example:
</p>
<pre class="literallayout">postmaster@[ipv6:fe80::a00:20ff:fe86:a061.5678]
</pre><p>
Exim allows <code class="literal">ipv4:</code> before IPv4 addresses, for consistency, and on the
grounds that sooner or later somebody will try it.
</p>
<p>
<a id="id569333" class="indexterm"></a>
If the IP address matches something in <span><strong class="option">ignore_target_hosts</strong></span>, the router
declines. If an IP literal turns out to refer to the local host, the generic
<span><strong class="option">self</strong></span> option determines what happens.
</p>
<p>
The RFCs require support for domain literals; however, their use is
controversial in today’s Internet. If you want to use this router, you must
also set the main configuration option <span><strong class="option">allow_domain_literals</strong></span>. Otherwise,
Exim will not recognize the domain literal syntax in addresses.
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