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Re: [netmod] rfc6991bis: inet:host

Ladislav Lhotka <ladislav.lhotka@nic.cz> Mon, 27 July 2020 13:18 UTC

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From: Ladislav Lhotka <ladislav.lhotka@nic.cz>
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Date: Mon, 27 Jul 2020 15:18:25 +0200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/3WIHf0HUxWwDiODTGBOlH8HU-wQ>
Subject: Re: [netmod] rfc6991bis: inet:host
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On 27. 07. 20 12:44, Juergen Schoenwaelder wrote:
> On Mon, Jul 27, 2020 at 10:51:31AM +0200, Ladislav Lhotka wrote:
>> Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> writes:
>>
>>> So would the following do the right thing?
>>
>> The invert-match pattern also needs to be added in order to avoid reserved labels:
> 
> Why are they illegal? If we make them illegal, how are we going to
> deal with hosts that have non-ASCII names?

I am not able to find in what sense the "Reserved LDH" labels of RFC
5890 are really reserved, and I am not sure about the implications of
permitting "xn--..." hostnames to be explicitly configured.

If we want to allow non-ASCII names, then it would IMO be safer to use a
type that expects straight Unicode for lexical representation and leave
it to the implementations to convert to Punycode where necessary, e.g.
when querying DNS.

Lada

> 
> /js
> 

-- 
Ladislav Lhotka
Head, CZ.NIC Labs
PGP Key ID: 0xB8F92B08A9F76C67

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