Re: [Int-area] I-D Action: draft-ietf-intarea-tunnels-03.txt

Hi Joe,

Sorry to say, but I still disagree with most aspects of the text on fragmentation
and MTU, which are largely the same as what appeared in the previous draft
version. I will say that we agree on one fact, however, in that fragmentation
is ultimately unavoidable.

When we discussed this last year, I thought we had established some things
that got reflected in Section 3.13 of 'draft-templin-aerolink'. I'd like to invite
you and the working group to review that text which IMHO presents a
better MTU and fragmentation consideration for tunnels.

Thanks - Fred
fred.l.templin@boeing.com

> -----Original Message-----
> From: Int-area [mailto:int-area-bounces@ietf.org] On Behalf Of Joe Touch
> Sent: Thursday, July 07, 2016 8:29 AM
> To: int-area@ietf.org
> Subject: Re: [Int-area] I-D Action: draft-ietf-intarea-tunnels-03.txt
> 
> Hi, all,
> 
> This update incorporates all pending changes, notably from detailed
> reviews and discussions with Fred Templin, Lucy Yong, Toerless Eckert,
> and Tom Herbert.
> 
> There's still a bit to do - notably to wrangle out what we want to say
> regarding other RFCs in Section 5. This, and the doc's evolution,
> suggest that it might be useful to consider shifting the intended track
> from Informational to BCP or beyond, depending on whether we need to be
> higher than BCP to "update" some of the problems outlined with
> standards-track docs (most notably RFC2003).
> 
> NOTE: A brief summary will be presented by the chairs in Berlin, but I
> will not be attending. Please use the list as the primary venue for
> discussion.
> 
> I am currently hoping we can decide how to proceed on this doc in the
> next few months so we can either remove or complete any "pending"
> sections and get to WGLC early this fall.
> 
> Joe
> 
> ---------
> 
> Summary of changes:
> - now "updates" 4459 (informational too)
> - revised MTU terminology based on list discussions (all MTUs indicate
> "link" payload sizes)
> - revised figures to indicate proximity of ingress/egress "interfaces"
> to nodes
> - moved Appendix A to new Section 3.6, as outer/inner fragmentation
> issue is core
> - revised Sec 4.2 (was 4.1) to explain why two different frag algs are
> presented
>     - one is implicit in all hosts/forwarders, irrespective of link
> technology
>     - one is contained "within" the link technology of a tunnel
> - updated recommendations throughout section 5
> 
> Summary of additions:
> - Sec 4.1 on the variety of MTU values
> - Sec 4.12 on multipoint tunnels
> - Sec 5.4 on diagnostics- Sec 5.5.1 on GUE
> - Sec 5.5.15 on RTGWG-DT-ENCAP
> - Security Considerations text on inner/outer tunnel vulnerabilities
> - Recommendation text for Sec 5.5.3 on RFC2003 (IPv4 in IPv4)
> 
> ----
> 
> On 7/6/2016 11:28 PM, internet-drafts@ietf.org wrote:
> > A New Internet-Draft is available from the on-line Internet-Drafts directories.
> > This draft is a work item of the Internet Area Working Group of the IETF.
> >
> >         Title           : IP Tunnels in the Internet Architecture
> >         Authors         : Joe Touch
> >                           Mark Townsley
> > 	Filename        : draft-ietf-intarea-tunnels-03.txt
> > 	Pages           : 47
> > 	Date            : 2016-07-06
> >
> > Abstract:
> >    This document discusses the role of IP tunnels in the Internet
> >    architecture, in which IP datagrams are carried as payloads in non-
> >    link layer protocols. It explains their relationship to existing
> >    protocol layers and the challenges in supporting IP tunneling based
> >    on the equivalence of tunnels to links.
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-intarea-tunnels/
> >
> > There's also a htmlized version available at:
> > https://tools.ietf.org/html/draft-ietf-intarea-tunnels-03
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-intarea-tunnels-03
> >
> >
> > Please note that it may take a couple of minutes from the time of submission
> > until the htmlized version and diff are available at tools.ietf.org.
> >
> > Internet-Drafts are also available by anonymous FTP at:
> > ftp://ftp.ietf.org/internet-drafts/
> >
> > _______________________________________________
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> > Int-area@ietf.org
> > https://www.ietf.org/mailman/listinfo/int-area
> 
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