interface_multicastinterface" id="dgram_socket_setmulticastinterface_multicastinterface">#</a></span></h3>
<div class="api_metadata">
<span>Added in: v8.6.0</span>
</div>
<ul>
<li><code>multicastInterface</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type">&#x3C;string></a></li>
</ul>
<p><em>All references to scope in this section are referring to
<a href="https://en.wikipedia.org/wiki/IPv6_address#Scoped_literal_IPv6_addresses">IPv6 Zone Indices