manual: mention needed options for IPv6

Changed files
+20
nixos
doc
manual
configuration
+20
nixos/doc/manual/configuration/ipv6-config.xml
···
</programlisting>
</para>
+
<para>As with IPv4 networking interfaces are automatically configured via
+
DHCPv6. You can configure an interface manually:
+
+
<programlisting>
+
networking.interfaces.eth0.ip6 = [ { address = "fe00:aa:bb:cc::2"; prefixLength = 64; } ];
+
</programlisting>
+
</para>
+
+
<para>For configuring a gateway, optionally with explicitly specified interface:
+
+
<programlisting>
+
networking.defaultGateway6 = {
+
address = "fe00::1";
+
interface = "enp0s3";
+
}
+
</programlisting>
+
</para>
+
+
<para>See <xref linkend='sec-ipv4' /> for similar examples and additional information.
+
</para>
</section>