s="memname">#define IP_OPTIONS_SEND&#160;&#160;&#160;(<a class="el" href="group__lwip__opts__ipv4.html#ga429e811a80ebb5157e14a854870c4410">LWIP_IPV4</a> &amp;&amp; <a class="el" href="group__lwip__opts__igmp.html#gadaf25915ae1fd69c0943ef68cbb38923">LWIP_IGMP</a>)</td>
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<p>Currently, the function ip_output_if_opt() is only used with IGMP </p>

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<h2 class="groupheader">Function Documentation</h2>
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