lass="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define LWIP_NETIF_HWADDRHINT&#160;&#160;&#160;0</td>
        </tr>
      </table>
</div><div class="memdoc">
<p>LWIP_NETIF_HWADDRHINT==1: Cache link-layer-address hints (e.g. table indices) in struct netif. TCP and UDP can make use of this to prevent scanning the ARP table for every sent packet. While this is faster for big ARP tables or many concurrent connections, it might be counterproductive 