On 13/11/2017 21:13, Tony Finch wrote: > Ray Bellis <r...@bellis.me.uk> wrote: >> >> Would it be feasible to reserve a standard RCODE value in the >> header that just means "see extended error"? > > That would require client-to-server signalling,
It would. Perhaps the *request* RCODE could contain the same value to signal acceptance of the extended version in the response ? > and the server would be unable to simply unconditionally include the > extended error in the OPT record. > > There can only be an EDNS RCODE if the client sent an EDNS OPT; if > the client forgot it sent the OPT then it's too broken to worry > about. Indeed - unsolicited EDNS OPT RRs aren't legal in responses. Ray _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
