[dns-operations] Zone cut on _tcp.example.ca

Joe Abley jabley at hopcount.ca
Tue Feb 9 15:28:36 UTC 2016

On 9 Feb 2016, at 10:15, David C Lawrence <tale at akamai.com> wrote:

> Jacques Latour writes:
>> One of our d-zone (secondary dns service) customers wants to a zone that
>> looks like this:  _tcp.example.ca
> Yep, it's fine.  Doesn't violate the LDH rules as long as their
> aren't any address records associated with that name or its
> descendants.
>> But then you could end up with RR like this;  _http._tcp.jack._tcp.cira.ca
> There's nothing intrinsically wrong with that name.

I agree. It's not a valid hostname, but it is a valid domain name. The presence or absence of zone cuts at any label boundary doesn't change that.


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