Re: [Int-area] I-D Action: draft-ietf-intarea-gre-ipv6-11.txt

["Templin, Fred L" <[e-mail]>]

Hi, this comment has not been acknowledged nor addressed. Please acknowledge
and address.

Thanks - Fred
[e-mail]

> -----Original Message-----
> From: Int-area [mailto:[e-mail]] On Behalf Of Templin, Fred L
> Sent: Monday, August 03, 2015 9:07 AM
> To: [e-mail]
> Subject: Re: [Int-area] I-D Action: draft-ietf-intarea-gre-ipv6-11.txt
> 
> I have a comment on this draft. In Section 3.2, it says:
> 
>   "However, a GRE ingress node can verify tunnel capabilities by sending
>    a 1280-byte IPv6 packet addressed to itself through the tunnel under test."
> 
> This text is missing the point that the GRE ingress is only the source of
> the delivery packet and is *not* the source of the payload packet.
> This means that, if the 1280-byte probe packets take a different path
> than the data packets, then the probes can fail to detect paths where
> the MTU is insufficient.
> 
> In order to fix this, the GRE ingress would need to make all delivery
> packets look the same to the network whether they carry probes
> or data packets. This means that the procedures specified in  RFC2983
> (diffserv and tunnels) and RFC6438 (flow label and tunnels) MUST be
> disabled if the 1280 byte probing recommendation of this draft is
> followed. By disabled, I mean set the DSCP and flow label in the
> delivery header to 0. The draft can either say this and cite the RFCs,
> or remove the recommendation for probing with 1280 byte probes.
> 
> Thanks - Fred
> [e-mail]
> 
> > -----Original Message-----
> > From: I-D-Announce [mailto:[e-mail]] On Behalf Of [e-mail]
> > Sent: Sunday, July 19, 2015 10:10 PM
> > To: [e-mail]
> > Cc: [e-mail]
> > Subject: I-D Action: draft-ietf-intarea-gre-ipv6-11.txt
> >
> >
> > 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 Working Group of the IETF.
> >
> >         Title           : IPv6 Support for Generic Routing Encapsulation (GRE)
> >         Authors         : Carlos Pignataro
> >                           Ron Bonica
> >                           Suresh Krishnan
> > 	Filename        : draft-ietf-intarea-gre-ipv6-11.txt
> > 	Pages           : 10
> > 	Date            : 2015-07-19
> >
> > Abstract:
> >    Generic Routing Encapsulation (GRE) can be used to carry any network-
> >    layer payload protocol over any network-layer delivery protocol.  GRE
> >    procedures are specified for IPv4, used as either the payload or
> >    delivery protocol.  However, GRE procedures are not specified for
> >    IPv6.
> >
> >    This document specifies GRE procedures for IPv6, used as either the
> >    payload or delivery protocol.  It updates the GRE specification, RFC
> >    2784.
> >
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-intarea-gre-ipv6/
> >
> > There's also a htmlized version available at:
> > https://tools.ietf.org/html/draft-ietf-intarea-gre-ipv6-11
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-intarea-gre-ipv6-11
> >
> >
> > 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/
> >
> > _______________________________________________
> > I-D-Announce mailing list
> > [e-mail]
> > https://www.ietf.org/mailman/listinfo/i-d-announce
> > Internet-Draft directories: http://www.ietf.org/shadow.html
> > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> 
> _______________________________________________
> Int-area mailing list
> [e-mail]
> https://www.ietf.org/mailman/listinfo/int-area