code> socket option. If the
<code>multicastInterface</code> argument is not specified, the operating system will choose
one interface and will add membership to it. To add membership to every
available interface, call <code>addMembership</code> multiple times, once per interface.</p>
<p>When called on an unbound socket, this method will implicitly bind to a random
port, listening on all interfaces.</p>
<p>When sharing a UDP socket across multiple <code>cluster</code> workers, the
<code>socket.addMembership(