In message <2a461723-1199-4c3c-b2e0-1955c91a7...@vpnc.org>, Paul Hoffman writes: > On Apr 15, 2013, at 10:14 AM, Edward Lewis <ed.le...@neustar.biz> wrote: > > > I have no problem with this in spirit. But I always wonder why the > > presentation formats, as in section 3.2 and 4.2, have MUST concer > > ning how the record is "written." I've never considered the presentation > > format to be subject to a standard...I realize that's just my > > opinion, but the on-the-wire format is what is subject to > > interoperability concerns. > > This has come up before, and there are indeed interoperability issues > with presentation formats. Developers will use examples they find > in the RFC and on the Internet to create encoders and parsers. If there > is an agreed-to presentation format, the likelihood of wire in > teroperability goes way up.
Web site developers not reading the RFCs has lead to problems entering perfectly valid DS records. > > The document can have the MUSTs but I'd prefer SHOULDs. > > A "SHOULD" is a "MUST except for these reasons". What would the reasons > be for using a different presentation format? > > > It's right that there's only one way these addresses ever get written, > > so the MUST seems logical, OTOH, it just seems over the top to > > demand it be written one way or another. I certainly understand it is > > INTENDED to be written as documented, but is it a sin if I implement > > something else? (How would an alternate form hinder interoperability.) I looked at accepting something else when implementing EUI48 and EUI64 in named then thought about the "named accepts it so it must be right" crowd. If you want more liberal formats they need to be documented and the LCD is a MUST the rest are MAYs or SHOULDs. > > Apparently I am a little cranky today. > > ...and haven't re-read RFC 2119 in a while. There is no mention of "sin". > > --Paul Hoffman > _______________________________________________ > DNSOP mailing list > DNSOP@ietf.org > https://www.ietf.org/mailman/listinfo/dnsop -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
