EDNS0 revisions

[Paul Vixie <paul@vix.com>]

i propose to revise RFC 2671 as follows:

1. remove extended label type.  (this "didn't work" inasmuch as it tries to
   provide an end-to-end feature using a hop-by-hop signalling method.  it
   should have been punted into EDNS1 along with RRD and the others.)

2. treatment of an unrecognized OPTION-CODE shall be the same as treatment
   of a non-zero "Z" field, which is, to ignore it.  (we ought not have to
   increment VERSION when allocating new OPTION-CODE values.)

3. change 5.3 as follows.  old:

   5.3. Responders who do not understand these protocol extensions are
        expected to send a response with RCODE NOTIMPL, FORMERR, or
        SERVFAIL.  ...

   new:

   5.3. Responders who do not understand these protocol extensions are
        expected to send a response with RCODE NOTIMPL, FORMERR, or
        SERVFAIL, or to appear to "time out" due to inappropriate action
        by a "middle box" such as a NAT.  ...

   old:

             ... Therefore use of extensions should be "probed" such that
        a responder who isn't known to support them be allowed a retry with
        no extensions if it responds with such an RCODE.  ...

   new:

             ... Therefore use of extensions should be "probed" such that
        a responder who isn't known to support them be allowed a retry with
        no extensions if it responds with such an RCODE, or does not respond.
        ...

4. a response should only contain an OPT RR if the request contained one.

while #3 above reflects implementation experience, it was foreseeable and
thus qualifies as an editorial error on my part in the original draft.  #1,
#2, and #4 are just editorial errors.

is there controversy around any of these, or, are there other things also
in need of clarification or correction from RFC 2671?

   


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