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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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