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General Internet Engineering Task Force DNS EDE This document is the specification of three new EDE (Extended DNS Errors) codes, for minimal answers, local roots and ECS (EDNS Client Subnet).

Introduction created the EDE (Extended DNS Errors). Each error is identified by a code, and there is an IANA registry of these codes. This specification adds three codes:

• One to say that the response has been tailored because of ECS,
• One to say that the response was deliberately minimal,
• One to say that the response comes from a local root.

Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.

ECS This response code, TBD, means that the response has been tailored because of ECS (EDNS CLient Subnet, ). It MAY be sent by authoritative servers or resolvers when they implement ECS. TODO if a resolver receives this EDE from an authoritative, should it copy it in the response sent to its client? TODO Could it also include tailoring for other reasons (like DNS load balancing)?

Minimal response This response code, TBD, means that the response to an ANY request was deliberately minimal, as documented by . It MAY be sent by authoritative servers or resolvers. TODO should we extend it also for cases like "glue not sent since I wanted to save bits"?

Local root This response code, TBD, means that the response comes from a local root, as documented in . It MAY be sent by resolvers using a local root.

IANA Considerations IANA is requested to allocate codes to these three EDE and to add them to the "Extended DNS Error Codes", with a reference to this document. Note that the policy for the registry "Extended DNS Error Codes" is just "First come, first served" so this document is not strictly necessary.

Security Considerations The EDE are sent with EDNS and are not signed. They should be used with care (see , section 6).

References Normative References Informative References

Acknowledgements Original idea by Marco Davids.