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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16710#discussion_r696970599">sys/test_utils/benchmark_udp/benchmark_udp.c</a>:</p>
<pre style='color:#555'>> +
+        res = sock_udp_recv(&sock, buf, sizeof(buf), 2 * delay_us, NULL);
+        if (res < 0) {
+            if (res != -ETIMEDOUT) {
+                printf("Error receiving message: %zd\n", res);
+            }
+            continue;
+        }
+
+        unsigned state = irq_disable();
+        if (cmd->flags & BENCH_FLAG_CMD_PKT) {
+            ping->seq_no  = 0;
+            ping->replies = 0;
+            ping->flags   = cmd->flags & BENCH_MASK_COOKIE;
+            delay_us      = cmd->delay_us;
+            payload_size  = cmd->payload_len;
</pre>
<p>isn't ip fragmentation off for ipv6 or does udp have its own</p>

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