Editing FR (section)

=== Nameserver requirements ===
'''Zone configuration:'''

<ul>
<li>the zone is installed on all the name servers (at least two servers)</li>
<li>the zone contact (RNAME) is legal; </li>
<li>the serial number of the zone is the same on each of the servers; </li>
<li>the values in the different fields of the SOA must comply with the following constraints
<ul>
<li> FIELD - Minimum Value - Maximum Value </li>
<li> Expires  - 1 week - 100 weeks </li>
<li> Minimum - 3 minutes - 1 week </li>
<li> Refresh - 1 hour - 2 days </li>
<li> Retry - 15 minutes - 1 day </li>
</ul>
</li>
<li> the value of the retry field is lower than that of the refresh field, and</li>
<li> the value of the expire field is far higher (at least seven times) than that of the refresh field;</li>
<li> the "TLL" duration in the SOA specifies the TLL for negative responses (NXDOMAIN) and must not be greater than one day; </li>
<li> the "TLL" duration must be at least one hour for SOA and NS registrations;</li>
<li> the list of name servers for the zone returned by the server, corresponds with the list of servers stated in the Request;</li>
<li> the hostmaster address for the zone is valid and can be contacted</li>
</ul>
<p><br>
<b>Configuration of name servers:</b></p>
<ul>
<li>the server has international IP connectivity;</li>
<li>the server can be contacted seven days a week, 24 hours a day;</li>
<li>it must be possible to access the DNS service on port 53 in UDP and TCP for packets sent from any machine over the Internet;</li>
<li>the server is authoritative for the zone requested;</li>
<li>for the ".in-addr.arpa" and "." .fr zones, the server must obtain a correct list of the corresponding name servers and is not authoritative if it does not</li>
<li>appear in this list. The server addresses specified must be correct;</li>
<li>the server obtains the correct address for each of the other servers in the zone;</li>
<li>the server carries out checksums on the UDP packets and generates IP packets with a TLL of at least 64;</li>
<li>the server does not forward requests to one of the AFNIC servers, it must be possible to obtain the names of the servers from their IP addresses.</li>
<li>AFNIC performs a zone pre-check. You may perform this pre-check by yourself to check if the nameservers are correct: https://zonemaster.net</li>
</ul>