check-names conflicts with SPF macro definition

[Mark Andrews]

SPF records are TXT record which are NOT subject to check-names processing.

If you created a seperate zone use nameservers that DO NOT live within the zone.
ns1._spf.switch.ch is NOT a legal hostname as it is not LDH.

> On 4 Jan 2021, at 20:01, Daniel Stirnimann <daniel.stirnimann at switch.ch> wrote:
> 
> Hello all,
> 
> I changed SPF for switch.ch to use SPF macros (RFC 7208). I wanted to
> use the "_spf" label but bind9 check-names complained with a "bad owner
> name (check-names)" message.
> 
> I have now used "spf" instead of "_spf", e.g. exists:%{ir}.spf.switch.ch
> 
> I didn't want to disable check-names for switch.ch because of this
> conflict. However, SPF record publishing is generally recommended to use
> the "_spf" subdomain which is not possible in this case.
> 
> I guess, the only alternative would have been to make "_spf.switch.ch"
> its own zone and set check-names for this zone statement to "ignore". Or
> would this be a good reasons to loosen the check-names rules in bind9?
> 
> Thanks,
> Daniel
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org