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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