DNS Referral Response Size Issues

Document Type Expired Internet-Draft (dnsop WG)
Last updated 2014-08-18 (latest revision 2014-02-14)
Stream IETF
Intended RFC status Informational
Expired & archived
plain text pdf html bibtex
Stream WG state In WG Last Call
Document shepherd Suzanne Woolf
IESG IESG state Expired (IESG: Dead)
Consensus Boilerplate Unknown
Telechat date
Responsible AD Ron Bonica
IESG note WG Last Call issued 21 Nov
Send notices to <sra+dnsop@hactrn.net>,<dmm@1-4-5.net>

This Internet-Draft is no longer active.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


With a mandated default minimum maximum UDP message size of 512 octets, the DNS protocol presents some special problems for zones wishing to expose a moderate or high number of authority servers (NS resource records). This document explains the operational issues caused by, or related to this response size limit, and suggests ways to optimize the use of this limited space. Guidance is offered to DNS server implementors and to DNS zone administrators.


Paul Vixie (vixie@farsightsecurity.com)
Akira Kato (kato@wide.ad.jp)
Joe Abley (jabley@dyn.com)

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