I-D ACTION:draft-ietf-dnsext-dnssec-opt-in-00.txt

["Scott Rose" <scottr@antd.nist.gov>]

----- Original Message -----
From: "Scott Rose" <scottr@antd.nist.gov>
To: "Roy Arends" <Roy.Arends@nominum.com>
Sent: Tuesday, July 03, 2001 4:23 PM
Subject: Re: I-D ACTION:draft-ietf-dnsext-dnssec-opt-in-00.txt


> > On Tue, 3 Jul 2001, Olafur Gudmundsson wrote:
> >
> > > At 10:08 AM 7/2/2001, Roy Arends wrote:
> > > >On Fri, 29 Jun 2001, Roy Arends wrote:
> > > >
> > > >In my opinion, it should be the NXT record itself rather than the KEY
> > > >record to indicate how it should be interpreted.
> > > >
> > > >About the zero bit:
> > > >
> > > >rfc2535, section 5.2 mentions the zero bit.
> > > >
> > > >         The first bit represents RR type zero (an illegal type which
> > > >         can not be present) and so will be zero in this format.
This
> format
> > > >         is not used if there exists an RR with a type number greater
> than
> > > >         127.  If the zero bit of the type bit map is a one, it
> indicates that
> > > >         a different format is being used which will always be the
case
> if a
> > > >         type number greater than 127 is present.
> > > >
> > > >As stated, if the type bit zero is a one, it indicates a different
> format.
> > > >The different format in this case is the opt-in format.
> > >
> > > This bit is off limits to any use but to extend NXT to types with code
>
> 127.
> > > If you want to use a bit in NXT to define Opt-in there are few type
> codes
> > > that I can pull out of the hat to do that from the low number bits
> (SINK,
> > > MB, etc.) or we just reserve a new type code for this.
> >
> > Perfect. We could even use a bit >127 then.
> >

 If the group decides to use a bit to determine the opt-in status (I haven't
decided if I like the idea or not - right now I'm leaning towards "not" but
don't have a better solution yet) - let's pick an unused number to avoid any
potential messy bugs with oddball zonefiles that may use exotic RR types
(like LOC, RP, etc).

 Just to be safe, and there are numbers to spare.

 Scott