[DNSOP] Last Call: <draft-ietf-dnsop-edns-tcp-keepalive-04.txt> (The edns-tcp-keepalive EDNS0 Option) to Proposed Standard
The IESG <iesg-secretary@ietf.org> Mon, 16 November 2015 16:23 UTC
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Subject: [DNSOP] Last Call: <draft-ietf-dnsop-edns-tcp-keepalive-04.txt> (The edns-tcp-keepalive EDNS0 Option) to Proposed Standard
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The IESG has received a request from the Domain Name System Operations WG (dnsop) to consider the following document: - 'The edns-tcp-keepalive EDNS0 Option' <draft-ietf-dnsop-edns-tcp-keepalive-04.txt> as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2015-11-30. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. 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 commonly use TCP only for fallback 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 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 file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-dnsop-edns-tcp-keepalive/ IESG discussion can be tracked via https://datatracker.ietf.org/doc/draft-ietf-dnsop-edns-tcp-keepalive/ballot/ No IPR declarations have been submitted directly on this I-D.