Interoperable Domain Name System (DNS) Server Cookies

Document Type Replaced Internet-Draft (dnsop WG)
Authors Ondřej Surý  , Willem Toorop  , Donald Eastlake  , Mark Andrews 
Last updated 2019-07-22 (latest revision 2019-06-26)
Replaces draft-sury-toorop-dns-cookies-algorithms
Replaced by RFC 9018
Stream Internet Engineering Task Force (IETF)
Intended RFC status Internet Standard
Expired & archived
pdf htmlized (tools) htmlized bibtex
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
Responsible AD (None)
Send notices to Tim Wicinski <>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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 Eastlake (
Mark Andrews (

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