On Mon, Feb 22, 2016 at 7:21 AM, Sara Dickinson <s...@sinodun.com> wrote:
> All, > > This update addresses all of the outstanding comments from the IESG review > of this document, apart from a decision on the question about DNS-over-DTLS. > > Joel/Tim - is there an update on that decision? > > Regards > > Sara. > > > On 22 Feb 2016, at 12:08, internet-dra...@ietf.org wrote: > > > > > > 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 of the > IETF. > > > > Title : The edns-tcp-keepalive EDNS0 Option > > Authors : Paul Wouters > > Joe Abley > > Sara Dickinson > > Ray Bellis > > Filename : draft-ietf-dnsop-edns-tcp-keepalive-06.txt > > Pages : 14 > > Date : 2016-02-22 > > > > 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 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. > > > > > > 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: > > https://tools.ietf.org/html/draft-ietf-dnsop-edns-tcp-keepalive-06 > > > > A diff from the previous version is available at: > > https://www.ietf.org/rfcdiff?url2=draft-ietf-dnsop-edns-tcp-keepalive-06 > > > I am not understanding one thing. 3.3.2. Sending Responses Says that a server "that receives a query ... without the edns-tcp-keepalive option ... MAY include the edns-tcp-keepalive option in the response" But 3.4. TCP Session Management Indicates that a server can only send the edns-tcp-keepalive option in an answer if the client includes it in the request. -- Bob Harold
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