[DNSOP] I-D Action: draft-ietf-dnsop-edns-tcp-keepalive-00.txt
internet-drafts@ietf.org Fri, 11 April 2014 21:40 UTC
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Subject: [DNSOP] I-D Action: draft-ietf-dnsop-edns-tcp-keepalive-00.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Domain Name System Operations Working Group of the IETF. Title : The edns-tcp-keepalive EDNS0 Option Authors : Paul Wouters Joe Abley Filename : draft-ietf-dnsop-edns-tcp-keepalive-00.txt Pages : 10 Date : 2014-04-11 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 RFC 5966 suggests closing idle TCP sessions "in the order of seconds", making use of TCP only suitable for individual queries generated as a fallback protocol for truncated UDP answers. 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-ietf-dnsop-edns-tcp-keepalive/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-dnsop-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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