TLS for DNS: Initiation and Performance Considerations

Document Type Replaced Internet-Draft (dprive WG)
Authors Zi Hu  , Liang Zhu  , John Heidemann  , Allison Mankin  , Duane Wessels  , Paul Hoffman 
Last updated 2015-10-14 (latest revision 2015-04-15)
Replaced by draft-ietf-dprive-start-tls-for-dns
Stream Internet Engineering Task Force (IETF)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-dprive-start-tls-for-dns
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document offers an approach to initiating TLS for DNS: use of a dedicated DNS-over-TLS port, and fallback to a mechanism for upgrading a DNS-over-TCP connection over the standard port (TCP/53) to a DNS-over-TLS connection. Encryption provided by TLS eliminates opportunities for eavesdropping on DNS queries in the network, such as discussed in RFC 7258. In addition it specifies two usage profiles for DNS-over-TLS. Finally, it provides advice on performance considerations to minimize overheads from using TCP and TLS with DNS, pertaining to both approaches.


Zi Hu (
Liang Zhu (
John Heidemann (
Allison Mankin (
Duane Wessels (
Paul Hoffman (

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