Re: DNS RRTYPEs, the difficulty with

On Monday, February 27, 2012 12:32:11 PM Paul Hoffman wrote:
> On Feb 27, 2012, at 11:57 AM, Murray S. Kucherawy wrote:
> > > -----Original Message-----
> > > From: ietf-bounces(_at_)ietf(_dot_)org 
> > > [mailto:ietf-bounces(_at_)ietf(_dot_)org] On Behalf
> > > Of Patrik Fältström Sent: Monday, February 27, 2012 11:43 AM
> > > To: Hector
> > > Cc: ietf(_at_)ietf(_dot_)org
> > > Subject: Re: DNS RRTYPEs, the difficulty with
> > >
> > > I have not heard anything else than arguments in RFC5507 against
> > > reusing same RRType for many different kind of use.
> > >
> > > 5507 Design Choices When Expanding the DNS. IAB, P. Faltstrom, Ed., R.
> > >
> > >     Austein, Ed., P. Koch, Ed.. April 2009. (Format: TXT=44045
> > >     bytes)
> > >     (Status: INFORMATIONAL)
> > >
> > > So, still, no, you should not reuse TXT. You should have your own
> > > RRType. Other choices makes your design very complex.
> > >
> > > Yes, many people will still disagree with me, using arguments I do not
> > > agree with...
> > The conclusion of Section 3.5 of that document doesn't really address
> > the first bullet in the same section, namely that the user interface by
> > which the new RRType would get added to a zone often doesn't support
> > doing so.  That's turned out to be a serious problem with, for example,
> > the deployment of the SPF record (RRType 99).
> Which user interfaces are people using to add RRtype 99? If you are having
> them edit zone files by hand well, yes, that would not work real well for
> SPF. If there is a simple tool that takes the needed information and create
> a standard-formatted record that can be copy-and-pasted, it would make use
> of that RRtype much easier. If no such tool exists, I propose that it can
> be created easily.
We've published a script to take a Type TXT SPF record and give a Type SPF 
output as part of the pyspf library since very shortly after Type SPF was 
assigned.  It's been around for years, so the lack of that type of tool isn't 
an issue.

Scott K
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