Configuring different TTLs in multiple RRs for the same domain name, TYPE, and CLASS

[Ben Bridges]

I tend to agree with you about the overloading of TXT records.

Thanks,
Ben

-----Original Message-----
From: bind-users-bounces at lists.isc.org [mailto:bind-users-bounces at lists.isc.org] On Behalf Of Ray Bellis
Sent: Thursday, March 24, 2016 11:22 AM
To: bind-users at lists.isc.org
Subject: Re: Configuring different TTLs in multiple RRs for the same domain name, TYPE, and CLASS

On 24/03/2016 16:18, Ben Bridges wrote:
> TXT records are multiple-purpose.  They can be used for SPF records, 
> Office 365 "MS" records, DMARC records, or whatever arbitrary uses 
> someone dreams up, all for the same domain name.  Microsoft wants a 
> short TTL for their Office 365 records, but I would prefer to 
> generally use a longer TTL for most records (including other TXT 
> records) in order to reduce the query load on our servers.  It would 
> be nice to be able to set a short TTL for the Office 365 record but a 
> longer TTL for other TXT records for the same domain name.

OK, I can see why you'd want that, but it's yet another reason why overloading TXT records for multiple purposes was (and remains) a bad idea :(

As explained by RFC 2181, an RRset is supposed to be indivisible, and "bad things happen" if some parts of an RRset expire before others.

Ray


_______________________________________________
Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list

bind-users mailing list
bind-users at lists.isc.org
https://lists.isc.org/mailman/listinfo/bind-users