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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/7149#discussion_r137558738">pkg/openthread/include/platform_config.h</a>:</p>
<pre style='color:#555'>> + */
+
+#ifndef PLATFORM_CONFIG_H
+#define PLATFORM_CONFIG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @def OPENTHREAD_CONFIG_NUM_MESSAGE_BUFFERS
+ *
+ * The number of message buffers in buffer pool
+ */
+#if OPENTHREAD_ENABLE_NCP_UART
+#define OPENTHREAD_CONFIG_NUM_MESSAGE_BUFFERS       5
</pre>
<p>This buffer size is so mall, which is the main reason why we cannot ping through the border router. I increased it to 40 and ping works well now :)</p>

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