A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : The edns-tcp-keepalive EDNS0 Option
Author(s) : Paul Wouters
Joe Abley
Filename : draft-wouters-edns-tcp-keepalive-00.txt
Pages : 9
Date : 2013-10-15
Abstract:
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 are currently
limited in their use of the TCP transport as most implementations
limit the TCP session to a single DNS query and answer, making use of
TCP only suitable as a fallback protocol for UDP.
This document defines an EDNS0 option ("edns-tcp-keepalive") that
allows DNS clients and servers to signal their respective readiness
to conduct multiple DNS transactions over individual TCP sessions.
This signalling facilitates a better balance of UDP and TCP transport
between individual clients and servers, reducing the impact of
problems associated with UDP transport and allowing the state
associated with TCP transport to be managed effectively with minimal
impact on the DNS transaction time.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-wouters-edns-tcp-keepalive
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-wouters-edns-tcp-keepalive-00
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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