On 8/23/22 07:02, Ray Bellis wrote:
There will be a very long tail of systems out there that do not know about 
".alt".

How would those systems respond when passed a domain-style name that does not 
meet domain-style syntax rules (specifically those for total length and label 
lengths) ?
Designers of that other non-DNS protocol will have to consider all kinds of 
interoperability issues, including what kind of strings are permissible under 
their branch of .alt, and what consequences would arise from that.

IMO, that is within the realm of the specification of that other non-DNS 
protocol, just like any other protocol consideration that occurs when evolving 
a specification while implementing it; we DNS people don't have to mandate 
fences for the general case.

Best,
Peter

--
https://desec.io/

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