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Interoperable Domain Name System (DNS) Server Cookies

Document Type Replaced Internet-Draft (dnsop WG)
Expired & archived
Authors Ondřej Surý , Willem Toorop , Donald E. Eastlake 3rd , Mark P. Andrews
Last updated 2019-07-22 (Latest revision 2019-06-26)
Replaces draft-sury-toorop-dns-cookies-algorithms
Replaced by RFC 9018
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status Internet Standard
Additional resources Mailing list discussion
Stream WG state Adopted by a WG
Document shepherd Tim Wicinski
IESG IESG state Replaced by draft-ietf-dnsop-server-cookies
Consensus boilerplate Yes
Telechat date (None)
Responsible AD (None)
Send notices to Tim Wicinski <>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


DNS cookies, as specified in RFC 7873, are a lightweight DNS transaction security mechanism that provides limited protection to DNS servers and clients against a variety of denial-of-service and amplification, forgery, or cache poisoning attacks by off-path attackers. This document provides precise directions for creating Server Cookies so that an anycast server set including diverse implementations will interoperate with standard clients. This document updates [RFC7873]


Ondřej Surý
Willem Toorop
Donald E. Eastlake 3rd
Mark P. Andrews

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)