generally, we have not worried about versioning or capability negotiation among axfr/ixfr partners. a zone administrator can simply choose primary and secondary servers on the basis of advertised capabilities, and remove any who can't conform.
last time we had this discussion, it emerged that many secondary and primary name service providers had their own private protocol and either did not support ixfr/axfr at all, or did not support any of their competitive extensions (like apex cname) over ixfr/axfr. it's my view that BULK is better than $GENERATE and i would have proposed the former rather than the latter had i known then what i know now. i further believe that it need not be a negotiated capability between ixfr/axfr partners. vixie _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
