Eszett and IDNAv2 vs IDNA2008
Jaap Akkerhuis
jaap at NLnetLabs.nl
Thu Mar 12 21:40:26 CET 2009
Yes, this is why I said "old clients would just use it as an ordinary
authority". In other words, the registrant would have to set things up
on the server side to make sure that e.g. xd--strae-oqa.shinkuro.com
could be asked for authoritative info. Is this impossible? Or bad for
other reasons?
It is impossible without making a fundamental change the DNS protocol.
Going back to you original example answer:
;; QUESTION SECTION:
;strasse.shinkuro.com. IN A
;; ANSWER SECTION:
strasse.shinkuro.com. 300 IN A 66.92.164.104
;; AUTHORITY SECTION:
shinkuro.com. 300 IN NS UDNS2.ULTRADNS.net.
shinkuro.com. 300 IN NS xd--strae-oqa.shinkuro.com.
shinkuro.com. 300 IN NS UDNS1.ULTRADNS.net.
All of the three nameservers should the same answer and that (or
no answer as at all) as the one in the query. If not, something is
horribly broken.
It is bad because there it will break the dns protocol for all the
old clients if this behavior is changed. There is no way to signal
the name server a "new" client is asking the question. (If you
could, you could have done just that from a start).
jaap
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