<html><head></head><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yiv6103809535"><div id="yui_3_16_0_1_1449235033566_682650"><div id="yui_3_16_0_1_1449235033566_682649" style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" id="yiv6103809535yui_3_16_0_1_1449235033566_674757"><div id="yui_3_16_0_1_1449235033566_682954"><span id="yui_3_16_0_1_1449235033566_682659">Quite the undertaking, considering models (and different firmware versions per model) by vendor, but certainly valuable info.<br></span></div><div id="yui_3_16_0_1_1449235033566_682952"><span id="yui_3_16_0_1_1449235033566_682659"><br></span></div><div id="yui_3_16_0_1_1449235033566_682835" dir="ltr"><span id="yui_3_16_0_1_1449235033566_682659">I know how my dlink works :) ... which provided a Win7 client the three RNS servers in order, then Win7 behaved as mentioned in <a id="yui_3_16_0_1_1449235033566_682865" href="https://support.microsoft.com/en-us/kb/2834226">NET: DNS: DNS client resolution timeouts</a> <br></span></div><div id="yui_3_16_0_1_1449235033566_683122" dir="ltr"><span id="yui_3_16_0_1_1449235033566_682659"><br></span></div><div id="yui_3_16_0_1_1449235033566_683123" dir="ltr"><span id="yui_3_16_0_1_1449235033566_682659">I was testing different RNS failure scenarios (as well as capturing packets via Wireshark) by using the dlink's firewall to simulate RNS outages.<br></span></div><div id="yui_3_16_0_1_1449235033566_682961" dir="ltr"><span id="yui_3_16_0_1_1449235033566_682659"><br></span></div><div style="width:450px; font-family: 'Georgia', 'Times', 'Times New Roman', 'serif';margin-top:5px; margin-bottom: 5px; background-color: #ffffff;" id="enhancrCard_0" class="link-enhancr-attachment link-enhancr-element richcompose-card" contenteditable="false"><table id="yui_3_16_0_1_1449235033566_683323" class="link-enhancr-element" style="width:450px; height:auto; position: relative; display: block;" border="0" cellpadding="0" cellspacing="0"><tbody id="yui_3_16_0_1_1449235033566_683322"><tr class="link-enhancr-element"><td class="link-enhancr-element" colspan="7" style="height: 1px; background-color: #e5e5e5; font-size: 1px; border-collapse: collapse;"><div class="link-enhancr-element" style="height: 1px; background-color: #e5e5e5; font-size: 1px; line-height:0px;"> </div></td></tr><tr class="link-enhancr-element"><td rowspan="5" class="link-enhancr-element" style="width: 1px; background-color: #e5e5e5; font-size: 1pt; border-collapse: collapse;"><div class="link-enhancr-element" style="width: 1px; background-color: #e5e5e5; font-size: 1pt;"> </div></td><td rowspan="5" class="link-enhancr-element" style="width: 14px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div class="link-enhancr-element" style="width: 14px; background-color: #ffffff; font-size: 14pt;"> </div></td><td colspan="2" class="link-enhancr-element" style="height: 6px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div class="link-enhancr-element" style="height: 6px; background-color: #ffffff; font-size: 6pt;"> </div></td><td rowspan="5" class="link-enhancr-element" style="width: 20px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div class="link-enhancr-element" style="width: 20px; background-color: #ffffff; font-size: 20pt;"> </div></td><td class="link-enhancr-element" rowspan="5" style="width: 1px; background-color: #e5e5e5; font-size: 1pt; border-collapse: collapse;" width="1"><div class="link-enhancr-element" style="width: 1px; background-color: #e5e5e5; font-size: 1pt;"> </div></td></tr><tr id="yui_3_16_0_1_1449235033566_683321"><td id="yui_3_16_0_1_1449235033566_683320" class="link-enhancr-element" colspan="2" style="width: 100%; vertical-align: middle; font-family: 'Georgia', 'Times', 'Times New Roman', 'serif';"><div id="yui_3_16_0_1_1449235033566_683319" class="link-enhancr-text-part link-enhancr-element" style="line-height:16.5px; background-color: #ffffff; width: 414px;"><div id="yui_3_16_0_1_1449235033566_683318" class="link-enhancr-element" style="word-wrap: break-word; word-break: break-all;"><span class="link-enhancr-element icon icon-shrink link-enhancr-toggle"></span><span class="link-enhancr-element icon icon-close link-enhancr-delete"></span><a href="https://support.microsoft.com/en-us/kb/2834226" class="link-enhancr-card-urlWrapper link-enhancr-element" style="text-decoration: none !important;text-decoration:none; color: #000000 !important; line-height: 100%; font-size: 18px; display: block;"><span class="link-enhancr-element link-enhancr-card-title" style="margin: 0; font-weight: normal;margin-bottom: 3px; font-size: 18px; line-height: 21px; max-height: 43px; color: #000000; overflow: hidden !important; display: inline-block;">NET: DNS: DNS client resolution timeouts</span></a><div id="yui_3_16_0_1_1449235033566_683317" style="font-size: 13px; line-height: 20px; color: #999999; max-height: 81px; font-family: 'Georgia', 'Times', 'Times New Roman', 'serif';overflow: hidden;" class="link-enhancr-card-description link-enhancr-element">Summary This document describes the fallback and timeout behavior that exist when one or more DNS Servers IPs are configured on a Windows DNS client. </div></div></div></td></tr><tr id="yui_3_16_0_1_1449235033566_683326"><td id="yui_3_16_0_1_1449235033566_683325" colspan="2" class="link-enhancr-element" style="height: 6px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div id="yui_3_16_0_1_1449235033566_683324" class="link-enhancr-element" style="height: 6px; background-color: #ffffff; font-size: 6pt;"></div></td></tr><tr><td class="link-enhancr-element" style="vertical-align: middle; font-family: 'Arial', 'Helvetica Neue', 'Helvetica', 'sans-serif';"><div class="link-enhancr-element" style="font-size: 0pt;"><a href="https://support.microsoft.com/en-us/kb/2834226" class="link-enhancr-card-url link-enhancr-element" style="color: black; text-decoration: none !important;text-decoration:none;cursor:pointer !important;" target="_blank"><span id="yui_3_16_0_1_1449235033566_682880" class="link-enhancr-element link-enhancr-view-on" style="display: inline-block; line-height: 11px; max-width: 314px; min-width: 254px; overflow: hidden; max-height: 13px; word-break: break-all;"><span class="link-enhancr-element link-enhancr-mobile-no-resize" style="vertical-align:middle; font-size: 9px; line-height: 11px; color: #999999; -moz-text-size-adjust: none; -ms-text-size-adjust: none; -webkit-text-size-adjust:none; text-size-adjust:none;">View on <span style="font-weight: bold" class="link-enhancr-view-on-domain">support.microsoft.com</span></span></span></a></div></td><td class="link-enhancr-element" style="vertical-align: middle; width: 100px; font-family: 'Arial', 'Helvetica Neue', 'Helvetica', 'sans-serif';"><div class="link-enhancr-element link-enhancr-preview-wrapper" style="max-width: 100px; min-width: 80px; overflow: hidden; text-align: right; line-height: 11px; max-height: 13px; font-size: 0pt;"><span class="link-enhancr-element link-enhancr-preview-by link-enhancr-mobile-no-resize" style="vertical-align:middle; font-size: 9px; line-height: 11px; color: #999999; -moz-text-size-adjust: none; -ms-text-size-adjust: none; -webkit-text-size-adjust:none; text-size-adjust:none;">Preview by Yahoo</span></div></td></tr><tr><td colspan="2" class="link-enhancr-element" style="height: 9px; background-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div class="link-enhancr-element" style="height: 9px; background-color: #ffffff; font-size: 9pt;"></div></td></tr><tr class="link-enhancr-element"><td class="link-enhancr-element" colspan="7" style="height: 1px; background-color: #e5e5e5; font-size: 1px; border-collapse: collapse;"><div class="link-enhancr-element" style="height: 1px; background-color: #e5e5e5; font-size: 1px; line-height:0px"> </div></td></tr></tbody></table></div><div id="yui_3_16_0_1_1449235033566_682825" dir="ltr"><br><span id="yui_3_16_0_1_1449235033566_682659"></span></div><div id="yui_3_16_0_1_1449235033566_682826" dir="ltr"><span id="yui_3_16_0_1_1449235033566_682659"><br></span></div></div> <br clear="none"><div id="yui_3_16_0_1_1449235033566_682661" class="yiv6103809535qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv6103809535yqt3239190677" id="yiv6103809535yqt04896"></div></div></div></div><div class=".yiv6103809535yahoo_quoted"> <div style="font-family:times new roman, new york, times, 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 Tuesday, December 15, 2015 12:41 PM, Paul Hoffman <phoffman@proper.com> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv6103809535y_msg_container">On 15 Dec 2015, at 8:09, Roosenraad, Chris wrote:<br clear="none"><br clear="none">> All,<br clear="none">><br clear="none">> Before I start in, and possibly re-invent the wheel, I’m curious if <br clear="none">> anyone has ever done any analysis of how major brand home routers <br clear="none">> (i.e. CPEs) behave with regards to the DNS servers their given via <br clear="none">> DHCP. Specifically, I’m curious how they choose between the various <br clear="none">> DNS servers they’re supplied…do they stick with one, do they round <br clear="none">> robin, is it random, etc.<br clear="none">><br clear="none">> So if anyone has done such research, I’d love to know about it. If <br clear="none">> not, and anyone wants to help me do such so that we can share it out <br clear="none">> here, please let me know.<br clear="none"><br clear="none">Greetings. Wearing my ICANN hat, I am about* to start a long-term <br clear="none">research project on how CPE and other middleboxes deal with the DNS in <br clear="none">many different ways. I had not thought of looking at how they deal with <br clear="none">multiple DNS names in coming from DHCP, but it would be easy for me to <br clear="none">do so, and thus will.<br clear="none"><br clear="none">I'm hoping to have at least a smattering of early results for the next <br clear="none">OARC meeting, but intend to keep doing more tests with more and more <br clear="none">systems over time.<br clear="none"><br clear="none">--Paul Hoffman<br clear="none"><br clear="none">* As in, literally tomorrow<div class="yiv6103809535yqt2295957441" id="yiv6103809535yqtfd06725"><br clear="none">_______________________________________________<br clear="none">dns-operations mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:dns-operations@lists.dns-oarc.net" target="_blank" href="mailto:dns-operations@lists.dns-oarc.net">dns-operations@lists.dns-oarc.net</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="https://lists.dns-oarc.net/mailman/listinfo/dns-operations">https://lists.dns-oarc.net/mailman/listinfo/dns-operations</a><br clear="none">dns-jobs mailing list<br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="https://lists.dns-oarc.net/mailman/listinfo/dns-jobs">https://lists.dns-oarc.net/mailman/listinfo/dns-jobs</a></div><br clear="none"><br clear="none"></div> </div> </div> </div></div></body></html>