<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Stephen,<div><br></div><div>You can not do a referral “horizontally”. You can refer down, or even up in some cases, but not sideways at the same level of the hierarchy.<div><br></div><div>Lots of metaphors come to mind at this point, the most obvious being a tree (I briefly thought about something like, “you can’t marry your first cousin, but you can marry your first cousin once removed, if she belongs to the net or org side of the family, but decided that was too awful, plus outdated because the family is a lot bigger now).</div><div><br></div><div>Suffice it to say that if you re-delegate <a href="http://subzone.contstoso.com">subzone.contstoso.com</a> from <a href="http://ns1.intermediatens.com">ns1.intermediatens.com</a> to <a href="http://ns1.redelegatedns.com">ns1.redelegatedns.com</a>, it will break.<br><div><br></div><div>-Rich<br><div><br></div><div><br><div><div>On Jul 10, 2014, at 8:42 AM, Stephen Malone <<a href="mailto:Stephen.Malone@microsoft.com">Stephen.Malone@microsoft.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div lang="EN-IE" link="#0563C1" vlink="#954F72" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div class="WordSection1" style="page: WordSection1;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">Hi Folks,<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">I’m looking to understand how recursive resolvers handle DNS domain re-delegations at the same level. For example:<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">=Parent zone:<span class="Apple-converted-space"> </span><a href="http://contoso.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">contoso.com</a>=<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">@ IN SOA <span class="Apple-converted-space"> </span><a href="http://ns1.contoso.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">ns1.contoso.com</a><span class="Apple-converted-space"> </span><a href="http://hostmaster.contoso.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">hostmaster.contoso.com</a>. (…<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">Subzone IN NS <span class="Apple-converted-space"> </span><a href="http://ns1.intermediatens.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">ns1.IntermediateNS.com</a>.<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">=Intermediate zone:<span class="Apple-converted-space"> </span><a href="http://subzone.constoso.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">Subzone.constoso.com</a>; Name Server:<span class="Apple-converted-space"> </span><a href="http://ns1.intermediatens.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">ns1.IntermediateNS.com</a>.=<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">@ IN SOA <span class="Apple-converted-space"> </span><a href="http://ns1.intermediatens.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">ns1.IntermediateNS.com</a>.<span class="Apple-converted-space"> </span><a href="http://hostmaster.contoso.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">hostmaster.contoso.com</a>. (…<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">@ IN NS <span class="Apple-converted-space"> </span><a href="http://ns1redelegatedns.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">ns1RedelegatedNS.com</a>.<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">=Re-delegated zone:<span class="Apple-converted-space"> </span><a href="http://subzone.constoso.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">Subzone.constoso.com</a>; Name Server:<span class="Apple-converted-space"> </span><a href="http://ns1.redelegatedns.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">ns1.RedelegatedNS.com</a>.=<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">@ IN SOA <span class="Apple-converted-space"> </span><a href="http://ns1.redelegatedns.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">ns1.RedelegatedNS.com</a>.<span class="Apple-converted-space"> </span><a href="http://hostmaster.contoso.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">hostmaster.contoso.com</a>. (…<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">@ IN NS <span class="Apple-converted-space"> </span><a href="http://ns1redelegatedns.com/" style="color: rgb(149, 79, 114); text-decoration: underline;">ns1RedelegatedNS.com</a>.<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">Will any recursive resolvers products/versions break with the above configuration?<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">Thanks,<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">Stephen Malone<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">Microsoft<o:p></o:p></div></div><br><hr><font face="Arial" color="Gray" size="1"><br>About Microsoft Ireland:<span class="Apple-converted-space"> </span><a href="http://www.microsoft.com/ireland" style="color: rgb(149, 79, 114); text-decoration: underline;">www.microsoft.com/ireland</a><br>Microsoft Ireland Operations Limited. 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