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<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">Dear all,</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">Can anyone clarify to me the use of the TTL for a NS record?</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">Let’s take the example of a *.be domain.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">A TTL value is present on both locations.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoListParagraph" style="text-indent:-18.0pt"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"><span style="">1)<span style="font:7.0pt "Times New Roman"">   
</span></span></span><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">In a dns.be server (for example x.dns.be): in my example here below, value is
</span><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"">86400   </span>
<span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"></span></p>
<p class="ecxMsoListParagraph" style="text-indent:-18.0pt"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"><span style="">2)<span style="font:7.0pt "Times New Roman"">   
</span></span></span><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">In the name server itself: in my example here below, value is
</span><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"">345600  </span>
<span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"></span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">If we plan to change the name server to be used for a certain domain, do we have to change the TTL in the dns.be?</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">Is this possible?</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">Is this value that all the cache servers use?</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">If yes…what about the TTL value of the name server itself?</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">Thank in advance of any useful feedback,</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">Hugo,</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><b><u><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">Example:</span></u></b></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">dig @localhost google.be NS +trace</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">; <<>> DiG 9.6-ESV-R4 <<>> @localhost google.be NS +trace</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">; (1 server found)</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">;; global options: +cmd</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      f.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      g.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      h.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      a.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      i.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      b.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      j.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      c.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      k.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      l.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      d.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      m.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">.                       502894  IN      NS      e.root-servers.net.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">;; Received 436 bytes from 127.0.0.1#53(127.0.0.1) in 0 ms</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">be.                     172800  IN      NS      m.ns.dns.be.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">be.                     172800  IN      NS      x.dns.be.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">be.                     172800  IN      NS      london.ns.dns.be.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">be.                     172800  IN      NS      prague.ns.dns.be.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">be.                     172800  IN      NS      brussels.ns.dns.be.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">be.                     172800  IN      NS      amsterdam.ns.dns.be.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">;; Received 307 bytes from 198.41.0.4#53(a.root-servers.net) in 27 ms</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="NL-BE">google.be.              86400   IN      NS      ns2.google.com.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="NL-BE">google.be.              86400   IN      NS      ns1.google.com.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="NL-BE">google.be.              86400   IN      NS      ns4.google.com.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="NL-BE">google.be.              86400   IN      NS      ns3.google.com.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">;; Received 109 bytes from 193.190.135.4#53(brussels.ns.dns.be) in 1 ms</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="NL-BE">google.be.              345600  IN      NS      ns4.google.com.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="NL-BE">google.be.              345600  IN      NS      ns1.google.com.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="NL-BE">google.be.              345600  IN      NS      ns3.google.com.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="NL-BE">google.be.              345600  IN      NS      ns2.google.com.</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US">;; Received 173 bytes from 216.239.36.10#53(ns3.google.com) in 18 ms</span></p>
<p class="ecxMsoNormal"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>                                         </div></body>
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