<p></p>
<p dir="auto">Thanks Henning!</p>
<p dir="auto">The <code class="notranslate">IPV6_PMTUDISC_DO</code> documentation says that it sets the Don't Fragment flag, which is absent in IPv6 because it always behaves that way.  The kernel will then refuse larger-MTU frames with <code class="notranslate">EMSGSIZE</code>; using <code class="notranslate">IPV6_PMTUDISC_WANT</code> instead will fragment the frame at Path MTU boundaries.  It is doubtful if the <code class="notranslate">_DO</code> setting works for IPv4, but it is not the intention of my PR to question code that has been around for very long.</p>
<p dir="auto">See <code class="notranslate">ip(7)</code> which is referenced from <code class="notranslate">ipv6(7)</code>.</p>

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