[dns-operations] How Recursive Resolvers handle domains re-delegated at the same level

Rich Goodson rgoodson at gronkulator.com
Thu Jul 10 14:09:34 UTC 2014


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.

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first cousin once removed, if she belongs to the net or org side of the family, but decided that was too awful, plus outdated because the family is a lot bigger now).

Suffice it to say that if you re-delegate subzone.contstoso.com from ns1.intermediatens.com to ns1.redelegatedns.com, it will break.


On Jul 10, 2014, at 8:42 AM, Stephen Malone <Stephen.Malone at microsoft.com> wrote:

> Hi Folks,
> I’m looking to understand how recursive resolvers handle DNS domain re-delegations at the same level. For example:
> =Parent zone: contoso.com=
> @                            IN           SOA       ns1.contoso.com hostmaster.contoso.com. (…
> Subzone              IN           NS          ns1.IntermediateNS.com.
> =Intermediate zone: Subzone.constoso.com; Name Server: ns1.IntermediateNS.com.=
> @                            IN           SOA       ns1.IntermediateNS.com. hostmaster.contoso.com. (…
> @                            IN           NS          ns1RedelegatedNS.com.
> =Re-delegated zone: Subzone.constoso.com; Name Server: ns1.RedelegatedNS.com.=
> @                            IN           SOA       ns1.RedelegatedNS.com. hostmaster.contoso.com. (…
> @                            IN           NS          ns1RedelegatedNS.com.
> Will any recursive resolvers products/versions break with the above configuration?
> Thanks,
> Stephen Malone
> Microsoft
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