returned!) </td></tr>
    <tr><td class="paramname">callback_arg</td><td>argument to pass to the callback function </td></tr>
    <tr><td class="paramname">dns_addrtype</td><td>- LWIP_DNS_ADDRTYPE_IPV4_IPV6: try to resolve IPv4 first, try IPv6 if IPv4 fails only<ul>
<li>LWIP_DNS_ADDRTYPE_IPV6_IPV4: try to resolve IPv6 first, try IPv4 if IPv6 fails only</li>
<li>LWIP_DNS_ADDRTYPE_IPV4: try to resolve IPv4 only</li>
<li>LWIP_DNS_ADDRTYPE_IPV6: try to resolve IPv6 only </li>
</ul>
</td></tr>
  </table>
  </dd>