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