We have a zone, "bar.example.com," that is all properly delegated from " example.com." Although the subzone still has many records, " foo.bar.example.com" and such, the administrative reasons for having it as a separate zone are not so important anymore, and it would be convenient to simply manage it as multi-label names all within the example.com zone. That is, foo.bar.example.com would now just be in example.com.
The first thing that ups the degree of difficulty is DNSSEC. example.com is signed. bar.example.com is properly delegated and also signed. How do we make the transition without invalidating bar.example.com and its contents? I can't think of a way to transition bar.example.com without going insecure, letting that propagate out, and then folding bar.example.com into example.com. Or is there some way we could do it without going insecure first? I am also a little concerned about pre-loading the multi-label names at bar.example.com and above into example.com. example.com and bar.example.com have the same NS records, the same servers. Could it present any issues having those "hidden" records and their associated NSEC3 records in example.com while the server still is serving bar.example.com? Would we want to go insecure with example.com too, just to be safe? Even without DNSSEC, there are some problems. If we manage an instantaneous change on all of the authoritative servers at once, we can still have cached records out there. You could still have a resolver with the NS and SOA of bar.example.com cached. It goes to ask for " doesntexist.bar.example.com" and gets a NXDOMAIN with an SOA for example.com in the auth section. It's expecting the SOA for bar.example.com. A standard-compliant resolver won't accept that. Am I just over-thinking this? Just lower the TTLs on the NS and DS records for bar.example.com as far as we dare, and make the changes and hope for the fewest inconsistencies possible? Are there some steps to take to do this with minimal chances for inconsistencies and breakage? We're using BIND dnssec-policy to manage DNSSEC for the zones.
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