]> Banu Systems Private Limited

6001 Beach Road, #19-09, Golden Mile Tower 199589 SG muks@banu.com https://banu.com/

Operations and Management Area Internet Engineering Task Force This memo documents EDNS Extended DNS Errors INFO-CODE values for rate-limited and over-quota conditions.

Introduction DNS nameservers return EDNS Extended DNS Errors options in query responses to provide extra details about the result of DNS query processing. This memo documents EDNS Extended DNS Errors INFO-CODE values to be returned when rate-limiting is performed, or an over-quota condition is reached.

"Rate Limited" EDE INFO-CODE When DNS queries or transactions are rate-limited, e.g., due to the effect of DNS Response Rate Limiting or client IP-address based rate limiting, nameservers may return RCODE=REFUSED or return truncated responses possibly with an empty answer section depending on the implementation. In such responses, nameservers MAY include an EDNS Extended DNS Error option with the INFO-CODE set to "Rate Limited" as provided in .

"Over Quota" EDE INFO-CODE When DNS queries or transactions cause an over-quota condition such as when the count of DNS UPDATEs allowed for a customer have breached a limit, nameservers may return failures. In such responses, nameservers MAY include an EDNS Extended DNS Error option with the INFO-CODE set to "Over Quota" as provided in .

Requirements notation 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 when, and only when, they appear in all capitals, as shown here.

Security considerations There are no security considerations.

IANA considerations IANA is requested to allocate the following code point in the "Extended DNS Error Codes" registry in the "Domain Name System (DNS) Parameters" registry group.

INFO-CODE	Purpose	Reference
TBD	Rate Limited	See .
TBD	Over Quota	See .

References Normative references Informative references