Re: [dnssd] New Version Notification for draft-sctl-service-registration-02.txt

Ted Lemon <mellon@fugue.com> Mon, 16 July 2018 21:24 UTC

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From: Ted Lemon <mellon@fugue.com>
Date: Mon, 16 Jul 2018 17:24:07 -0400
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To: Tom Pusateri <pusateri@bangj.com>
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Subject: Re: [dnssd] New Version Notification for draft-sctl-service-registration-02.txt
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On Mon, Jul 16, 2018 at 8:59 AM, Tom Pusateri <pusateri@bangj.com> wrote:

> The TTL addition still leaves ambiguity for the server implementation:
>
> "Service Registration servers SHOULD ensure that TTLs are reasonable:
> neither too long nor too short.  The TTL should never be longer than the
> lease time.”
>
> Can you give guidance for “too short”? “too long” seems to be > lease
> time. If this isn’t what you mean by “too long”, guidance on that would be
> appreciated too.
>
> And finally, if the TTL is “too long” or “too short”, how does the server
> respond? Does the server accept the registration and modify the TTL? Does
> the server reject the registration and return an error? What error code?
>

I've added text.   The answer is that it's not an error for the SRP Update
to contain a TTL that the server doesn't like—if the server doesn't like
it, it just overrides it.


> One minor nit. If I understand the distinction correctly, you use “domain”
> if the following places where you should use “zone”:
>
> Section 2:
>
> However, they can be assumed to be able to provide registration
> domain discovery and routing.
>
> Section 2.2:
>
> As described above, full-featured devices are responsible for knowing in
> what domain they should register their services.
>
> In terms of DNS terminology, the correct term is domain, not zone.   The
registration domain doesn't have to be at a zone cut.