Wait, I have just realized that in order to let mpd.service open both IPv4 and 
IPv6 ports I *need* net.ipv6.bindv6only = 1  (I have settted it now from /etc/
sysctl.d/bindv6only.conf)

I also observe that mpd.socket will not open the IPv4 port no matter the value 
of net.ipv6.bindv6only.

Now I'm even more confused.

-- 
 1: Una computadora sirve:
    * Para tratar de dominar el mundo, un caso conocido de esto fue el de
      Skinet
    Damian Nadales
    http://mx.grulic.org.ar/lurker/message/20080307.141449.a70fb2fc.es.html

Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/

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