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RFC 7828
Title: The edns-tcp-keepalive EDNS0 Option
Author: P. Wouters,
J. Abley,
S. Dickinson,
R. Bellis
Status: Standards Track
Stream: IETF
Date: April 2016
Mailbox: pwouters@redhat.com,
jabley@dyn.com,
sara@sinodun.com,
ray@isc.org
Pages: 11
Characters: 24282
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-dnsop-edns-tcp-keepalive-06.txt
URL: https://www.rfc-editor.org/info/rfc7828
DOI: http://dx.doi.org/10.17487/RFC7828
DNS messages between clients and servers may be received over
either UDP or TCP. UDP transport involves keeping less state
on a busy server, but can cause truncation and retries over
TCP. Additionally, UDP can be exploited for reflection attacks.
Using TCP would reduce retransmits and amplification. However,
clients commonly use TCP only for retries and servers typically
use idle timeouts on the order of seconds.
This document defines an EDNS0 option ("edns-tcp-keepalive")
that allows DNS servers to signal a variable idle timeout.
This signalling encourages the use of long-lived TCP connections
by allowing the state associated with TCP transport to be managed
effectively with minimal impact on the DNS transaction time.
This document is a product of the Domain Name System Operations
Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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