<p></p>
<p>Thanks for your appreciated replies!</p>
<p>I do not think this is a firewall issue because when using <code>dig</code> command I get no issues. Tried with two different sets of options:</p>
<ul>
<li><code>dig +bufsize=512</code> : got <code>Truncated, retrying in TCP mode</code> then a correct reply received through TCP</li>
<li>or simple <code>dig</code> : in that case I directly get the answer through UDP</li>
</ul>
<p>But of course it does not work when disallowing TCP retry mode and setting a 512 bytes buffer size<br>
(<code>dig +bufsize=512 +ignore</code>)</p>
<p>Tests show clearly now a limit based on packet size (512 bytes) but I still do not know where it comes from precisely.<br>
Will investigate deeper when I will have some time.</p>

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