[dnsext] How well supported are unknown RRs in modern resolvers?

[Doug Barton <[e-mail]>]

The point Nicholas made about moving the CLONE logic to the stub is 
something I'm interested in pursuing, but my understanding is that "a 
lot" of resolving name servers still have problems dealing with RR types 
they don't understand. Is this still true?

Imagine the following scenario:

1. stub requests clone1.example.org A
2. Old resolving name server (RNS) which doesn't understand the CLONE RR 
does it's thing, and gets back the A record, plus "clone1.example.org 
CLONE preferred.example.org" in the ANSWER section.

Does the RNS pass the unknown RR back to the stub? And sorry for my 
ignorance, but are there references to this that I can dig into?


Doug

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