<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1434394331710_8231">The hints hopefully point eventually to an authoritative server for ".". <br></div><div id="yui_3_16_0_1_1434394331710_8232">Whatever that authoritative server says overrides any hints, just like any other zone's authoritative NS. It does not matter how obsolete a delegation is, so long as some authoritative NS replies, the data from the delegation (hints) no longer matters.<br></div><div id="yui_3_16_0_1_1434394331710_8422"><br></div><div id="yui_3_16_0_1_1434394331710_8426" dir="ltr">HtH</div><div id="yui_3_16_0_1_1434394331710_8424" dir="ltr">Len<br></div> <br><div class="qtdSeparateBR"><br><br></div><div style="display: block;" class="yahoo_quoted"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font size="2" face="Arial"> On Monday, June 15, 2015 6:14 AM, Gaurav Kansal <gaurav.kansal@nic.in> wrote:<br> </font> </div> <br><br> <div class="y_msg_container"><div id="yiv5613757701"><style><!--
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--></style><div><div class="yiv5613757701WordSection1"><div class="yiv5613757701MsoNormal">Dear Team,</div><div class="yiv5613757701MsoNormal"> </div><div class="yiv5613757701MsoNormal">My caching DNS server is generating log of . NS queries to ROOT Servers. </div><div class="yiv5613757701MsoNormal">I have a hint file in my bind configuration and the same is up-to date.</div><div class="yiv5613757701MsoNormal"> </div><div class="yiv5613757701MsoNormal">The same behavior is occurring in multiple versions of BIND (tested on 9.7, 9.9 and on 9.10).</div><div class="yiv5613757701MsoNormal"> </div><div class="yiv5613757701MsoNormal">It must be for some purpose (may be BIND doesn’t trust hint file and cross check it from root servers).</div><div class="yiv5613757701MsoNormal">Can anyone put some light on this.</div><div class="yiv5613757701MsoNormal"> </div><div class="yiv5613757701MsoNormal"> </div><div class="yiv5613757701MsoNormal"><u>Sample tcpdump output :-</u></div><div class="yiv5613757701MsoNormal">15:36:42.440831 IP anydnsmby.27938 > k.root-servers.net.domain: 38907 [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">15:36:43.241203 IP anydnsmby.52261 > f.root-servers.net.domain: 3841 [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">15:36:43.624041 IP anydnsmby.48889 > k.root-servers.net.domain: 6314 [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">15:36:44.424047 IP anydnsmby.65507 > c.root-servers.net.domain: 27973 [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">15:37:42.071574 IP anydnsmby.38958 > i.root-servers.net.domain: 53519 [1au] NS? 117.240.177.150. (44)</div><div class="yiv5613757701MsoNormal">15:40:11.121122 IP anydnsmby.7941 > i.root-servers.net.domain: 62400 [1au] NS? 1.mr. (33)</div><div class="yiv5613757701MsoNormal">15:45:52.780062 IP anydnsmby.49432 > e.root-servers.net.domain: 54241+ [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">15:45:59.341780 IP anydnsmby.34368 > e.root-servers.net.domain: 55928+ [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">15:46:04.487088 IP anydnsmby.35621 > e.root-servers.net.domain: 7266+ [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">15:46:35.453029 IP anydnsmby.62875 > i.root-servers.net.domain: 4129 [1au] NS? comp-HP. (36)</div><div class="yiv5613757701MsoNormal">16:16:13.747955 IP anydnsmby.39690 > a.root-servers.net.domain: 8774+ [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">16:16:20.845363 IP anydnsmby.36994 > e.root-servers.net.domain: 63433+ [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">16:16:36.746049 IP anydnsmby.42878 > a.root-servers.net.domain: 48439+ [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">16:16:42.060534 IP anydnsmby.41018 > j.root-servers.net.domain: 5347+ [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">16:16:49.081649 IP anydnsmby.53661 > e.root-servers.net.domain: 54768+ [1au] NS? . (28)</div><div class="yiv5613757701MsoNormal">16:51:14.034065 IP anydnsmby.38025 > k.root-servers.net.domain: 52771 [1au] NS? 116.73.202.141. (43)</div><div class="yiv5613757701MsoNormal">16:51:14.835539 IP anydnsmby.19616 > i.root-servers.net.domain: 14926 [1au] NS? 116.73.202.141. (43)</div><div class="yiv5613757701MsoNormal">17:25:16.706395 IP anydnsmby.58045 > i.root-servers.net.domain: 30880 [1au] NS? 2.mr. (33)</div><div class="yiv5613757701MsoNormal">17:25:16.707072 IP anydnsmby.38495 > i.root-servers.net.domain: 43451 [1au] NS? 6.mr. (33)</div><div class="yiv5613757701MsoNormal">17:25:16.707989 IP anydnsmby.35834 > i.root-servers.net.domain: 61843 [1au] NS? 3.mr. (33)</div><div class="yiv5613757701MsoNormal">17:56:44.855060 IP anydnsmby.61903 > a.root-servers.net.domain: 23284 [1au] NS? 172.192.168.2. (42)</div><div class="yiv5613757701MsoNormal"> </div><div class="yiv5613757701MsoNormal">Regards,</div><div class="yiv5613757701MsoNormal">Gaurav Kansal</div></div></div></div><br>_______________________________________________<br>Please visit <a href="https://lists.isc.org/mailman/listinfo/bind-users" target="_blank">https://lists.isc.org/mailman/listinfo/bind-users </a>to unsubscribe from this list<br><br>bind-users mailing list<br><a ymailto="mailto:bind-users@lists.isc.org" href="mailto:bind-users@lists.isc.org">bind-users@lists.isc.org</a><br><a href="https://lists.isc.org/mailman/listinfo/bind-users" target="_blank">https://lists.isc.org/mailman/listinfo/bind-users</a><br><br></div> </div> </div> </div></div></body></html>