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DNS Replication in Multi Domain Forest

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I am currently working with the AD of a costumer that has the following structure: - One forest - One parent domain > Joe.local - Two Child domains > hello.joe.local and bye.joe.local

I am relatively new to the field but managed to find and resolve a bunch of existing issues like the removal of lingering objects, the repair of the failing DFS replication, etc. Unfortunately i can not figure out, what exactly is wrong with the DNS settings in the domains.

There are 3 DCs for each domain. Years ago, the costumer had 3 sites in different cites. So there where 3 sites in AD Sites and services. Since the costumer has only one location as of now, I put all the DCs in the site, where he is located and pointed all the SNs towards that. The parent domain is replicating its primary zone forst wide, the child's only domain wide. Both child domain have a primary, AD integrated zone for the other child, that is set to replicate domain wide. These have wildly different entries then the "real" primary zones in the domain, where they are hosted. Since i got DNS errors from DCdiag and ad status replication tool, saying that some DCs from the 2 child's can't reach each other, I set up forwarders within the child domains DCs towards the DCs of the other child. That solved the problem temporarily, after a couple hours the DCs couldn't find each other yet again. The whole AD structure was riddled with errors, wrong configurations, old NTDS settings and so on. And since im new to the topic, im not sure, if the DNS configuration is the way it should be. My questions are this: - Where the DNS zones in the child domains for the other child domain put there by a former admin, or are they created automatically - Should I just set the zones for the opposing child domains to forest wide replication? If I do so, who is the authority for the dns zone bye.joe.local and hello.joe.local? Will hosts go missing, because they will be deleted? > I tried putting conditional forworders in place, but when I did, I got the message, that this is not possible, since a zone with this name already exists.

Any help with this is greatly appreciated!



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