different TTLs for multiple TXT records
Mark Andrews
marka at isc.org
Sat Sep 26 14:13:02 UTC 2020
It won’t happen and there is zero point in doing so as all RRs in a RRset are deleted at the same time.
--
Mark Andrews
> On 26 Sep 2020, at 23:59, Verne Britton <vbritton at staff.wvnet.edu> wrote:
>
> I see that RFC2181, written I think 20+ years ago, says in part
>
>
>>
>> 5.2. TTLs of RRs in an RRSet
>>
>> Resource Records also have a time to live (TTL). It is possible for
>> the RRs in an RRSet to have different TTLs. No uses for this have
>> been found that cannot be better accomplished in other ways. This
>> can, however, cause partial replies (not marked "truncated") from a
>> caching server, where the TTLs for some but not all the RRs in the
>> RRSet have expired.
>>
>> Consequently the use of differing TTLs in an RRSet is hereby
>> deprecated, the TTLs of all RRs in an RRSet must be the same.
> [...]
>
>
>
> but in the last few years, perhaps even a decade, TXT record usage has expanded to be used for many different and unique purposes, such as domain ownership verification and SPF data.
>
>
> What is the proper avenue to request an enhancement so each TXT record can have its own unique TTL value?
>
> Can bind be changed to do this, or must the RFC be changed first?
>
>
> Or, please give advice on how to do this today :-)
>
>
> a live example for a client
>
>
> dig TXT newriver.edu
>
> ;; ANSWER SECTION:
> newriver.edu. 3590 IN TXT "docusign=b8923ecb-9c2e-4ead-ac43-17c3d522fd49"
> newriver.edu. 3590 IN TXT "MS=ms76391508"
>
>
> I desire to have the MS= record have a TTL of say 3600, but want the docusign record to have a TTL of 86400
>
> ... I put 3590 in there to make it easier to find it when looking at the zone file ...
>
>
>
> Verne
> --------------------------------------------------------------------
> Verne Britton, Lead Systems Programmer voice: (304) 293-5192 x230
> Systems Support Group (in WV, call 1-800-253-1558)
> West Virginia Network for FAX: (304) 293-5540
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