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Re: EDNS0 revisions

   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.  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.  If a responder's capability level is cached by a
   requestor, a new probe SHOULD be sent periodically to test for changes
   to responder capability.
I think it's reasonable for a responder who does not understand the OPT pseudo-RR to ignore it and respond as though the OPT were absent from the request. As the above paragraph stands, that's unexpected behavior. Is there any reason it should be? 

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