A new Request for Comments is now available in online RFC libraries. 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: pwout...@redhat.com, jab...@dyn.com, s...@sinodun.com, r...@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 memo is unlimited. This announcement is sent to the IETF-Announce and rfc-dist lists. To subscribe or unsubscribe, see https://www.ietf.org/mailman/listinfo/ietf-announce https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist For searching the RFC series, see https://www.rfc-editor.org/search For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-edi...@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC