[bind10-dev] Resolver response to NOTIFY query

[Stephen Morris]

With the current version of BIND 10, when I send a query with opcode 4
(NOTIFY) to the resolver, I get a response of "not authoritative for
zone" (rcode = 9).

RFC 1996 which introduces Notify only seems to cover the case of
master-slave communication.  But it says:

   If a NOTIFY request is received by a slave who does not
   implement the NOTIFY opcode, it will respond with a NOTIMP
   (unimplemented feature error) message.

In our case, the resolver has no ability to respond to a notify, which
is why a "not implemented" (rcode = 4) response seems logical.  But as
the server is not configured to accept notifies from the sending system,
perhaps some other response is appropriate, e.g. BIND 9.7.1 returns
format error (rcode = 1).

Thoughts?

Stephen