<p><b>@aabadie</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11011#discussion_r256718558">sys/include/net/ndp.h</a>:</p>
<pre style='color:#555'>> @@ -193,6 +193,18 @@ extern "C" {
 #define NDP_MAX_RANDOM_FACTOR       (1500U)     /**< MAX_RANDOM_FACTOR (x 1000) */
 /** @} */
 
+/**
+ * @brief   Hop-limit required for most NDP messages to ensure link-local
</pre>
<p>Why <code>most</code> ? It seems that all message types uses this value, no ?</p>

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