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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