Domain names without a trailing period are relative to the current origin.
Domain names with a trailing period are absolute.
If you want to add the record
foo.bar.example.com. TXT …
and the current origin is example.com. You can enter it as
foo.bar TXT …
or
foo.bar.example.com. TXT …
or you could set the origin to bar.example.com. and do this
$ORIGIN bar.example.com.
foo TXT …
This applies to all domain names in zone files.
Mark
> On 1 Mar 2021, at 10:41, Tim Daneliuk via bind-users
> <bind-users@lists.isc.org> wrote:
>
> I am trying to understand when the LHS of a TXT record needs to be terminated
> with '.'.
>
> For example, I see this one of the machines I am managing. The server in
> question is
> the zone authority for foo.com:
>
> foo.com. IN TXT "v=spf1 ...
> foo.com. IN SPF "v=spf1 ...
> something._domainkey IN TXT "v=DKIM1 ...
> _dmark.foo.com. IN TXT "v=DMARC1 ...
>
> Could some kind soul explain why the DKIM key name does not require the
> trailing period, but
> why all the foo.com entries do?
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--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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