



Internet Engineering Task Force                             M. Sivaraman
Internet-Draft                              Banu Systems Private Limited
Intended status: Experimental                           25 February 2026
Expires: 29 August 2026


                DNS EDE option for rate-limited queries
                   draft-muks-dns-ede-rate-limited-02

Abstract

   This memo documents EDNS Extended DNS Errors INFO-CODE values for
   rate-limited and over-quota conditions.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on 29 August 2026.

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   document authors.  All rights reserved.

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   provided without warranty as described in the Revised BSD License.







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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  "Rate Limited" EDE INFO-CODE  . . . . . . . . . . . . . . . .   2
   3.  "Over Quota" EDE INFO-CODE  . . . . . . . . . . . . . . . . .   2
   4.  Requirements notation . . . . . . . . . . . . . . . . . . . .   2
   5.  Security considerations . . . . . . . . . . . . . . . . . . .   3
   6.  IANA considerations . . . . . . . . . . . . . . . . . . . . .   3
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     7.1.  Normative references  . . . . . . . . . . . . . . . . . .   3
     7.2.  Informative references  . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   3

1.  Introduction

   DNS nameservers return EDNS Extended DNS Errors options [RFC8914] 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.

2.  "Rate Limited" EDE INFO-CODE

   When DNS queries or transactions are rate-limited, e.g., due to the
   effect of DNS Response Rate Limiting [RRL] 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 Section 6.

3.  "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 Section 6.

4.  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
   [RFC2119] [RFC8174] when, and only when, they appear in all capitals,
   as shown here.





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5.  Security considerations

   There are no security considerations.

6.  IANA considerations

   IANA has allocated the following code points in the "Extended DNS
   Error Codes" registry in the "Domain Name System (DNS) Parameters"
   registry group.

               +===========+==============+================+
               | INFO-CODE | Purpose      | Reference      |
               +===========+==============+================+
               | 31        | Rate Limited | See Section 2. |
               +-----------+--------------+----------------+
               | 32        | Over Quota   | See Section 3. |
               +-----------+--------------+----------------+

                                  Table 1

7.  References

7.1.  Normative references

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8914]  Kumari, W., Hunt, E., Arends, R., Hardaker, W., and D.
              Lawrence, "Extended DNS Errors", RFC 8914,
              DOI 10.17487/RFC8914, October 2020,
              <https://www.rfc-editor.org/info/rfc8914>.

7.2.  Informative references

   [RRL]      Vixie, P. and V. Schryver, "DNS Response Rate Limiting
              (DNS RRL)", 2012,
              <https://ftp.isc.org/isc/pubs/tn/isc-tn-2012-1.txt>.

Author's Address






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   Mukund Sivaraman
   Banu Systems Private Limited
   6001 Beach Road, #19-09, Golden Mile Tower
   SINGAPORE 199589
   Singapore
   Email: muks@banu.com
   URI:   https://banu.com/












































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