Chunk NixOS manual

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diff --git a/nixos/doc/manual/configuration/ad-hoc-network-config.xml b/nixos/doc/manual/configuration/ad-hoc-network-config.xml
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+<section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="ad-hoc-network-config">
+
+<title>Ad-Hoc Configuration</title>
+
+<para>You can use <option>networking.localCommands</option> to specify
+shell commands to be run at the end of
+<literal>network-setup.service</literal>.  This is useful for doing
+network configuration not covered by the existing NixOS modules.  For
+instance, to statically configure an IPv6 address:
+
+<programlisting>
+networking.localCommands =
+  ''
+    ip -6 addr add 2001:610:685:1::1/64 dev eth0
+  '';
+</programlisting>
+
+</para>
+
+</section>