* W. C. A. Wijngaards: > +1. Backwards compatibility means you cannot specify that existing > implementations have to change.
Does it matter if they do not exist or are not considered practically relevant? As a counterexample, RFC 6891 requires FORMERR responses without OPT RRs from implementations which do not support EDNS: Responders that choose not to implement the protocol extensions defined in this document MUST respond with a return code (RCODE) of FORMERR to messages containing an OPT record in the additional section and MUST NOT include an OPT record in the response. _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
