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          <td class="paramtype">struct <a class="el" href="structpbuf.html">pbuf</a> *&#160;</td>
          <td class="paramname"><em>q</em>&#160;</td>
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          <td>)</td>
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<p>Send an ARP request for the given IP address and/or queue a packet.</p>
<p>If the IP address was not yet in the cache, a pending ARP cache entr