code>'udp4'</code> or <code>'udp6'</code>.
Required.</li>
<li><code>reuseAddr</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type">&#x3C;boolean></a> When <code>true</code> <a href="#dgram_socket_bind_port_address_callback"><code>socket.bind()</code></a> will reuse the
address, even if another process has already bound a socket on it.
<strong>Default:</strong> <code>false</code>.</li>
<li><code>ipv6Only</code> <a href="https://developer.mozilla.o