Fred,
What happens when a legacy device that supports 2784 and 2890 receives a packet
that is fragmented as per draft-ietf-intarea-gre-mtu?
Is that behavior acceptable?
Ron
> -----Original Message-----
> From: Templin, Fred L [mailto:[email protected]]
> Sent: Thursday, April 09, 2015 1:44 PM
> To: Ronald Bonica; [email protected]
> Subject: RE: [Int-area] AD Evaluation: draft-ietf-intarea-gre-mtu
>
> Hi Ron,
>
> > -----Original Message-----
> > From: Int-area [mailto:[email protected]] On Behalf Of Ronald
> > Bonica
> > Sent: Thursday, April 09, 2015 10:37 AM
> > To: [email protected]
> > Subject: Re: [Int-area] AD Evaluation: draft-ietf-intarea-gre-mtu
> >
> > Fred,
> >
> > How would you achieve backwards compatibility with legacy
> > implementations? If backwards compatibility cannot be achieved, maybe
> you are talking about a new protocol, that will ultimately replace GRE?
>
> Haven't thought about it too much, but I assume backwards compat would
> be handled in the same way that it was handled when RFC2784 was updated
> by RFC2890. That is why this document says "updates RFC2784 and RFC2890".
>
> Plus, two new bits have been carved out of the Reserved0 field in the GRE
> header and, if the bits are non-zero, it is a pretty good indication that the
> fragment header is included.
>
> Thanks - Fred
> [email protected]
>
> > Ron
> >
> >
> > > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> > >
> > >
> > > Title : GRE Tunnel Fragmentation
> > > Author : Fred L. Templin
> > > Filename : draft-templin-intarea-grefrag-00.txt
> > > Pages : 5
> > > Date : 2015-04-09
> > >
> > > Abstract:
> > > GRE tunnels use IPv4 or IPv6 fragmentation of the delivery packet
> > > when the delivery packet exceeds the tunnel MTU, or when otherwise
> > > necessary. This can cause problems when unmitigated IPv4
> > > fragemntation ensues, or when middleboxes drop IPv6 fragments
> > > unconditionally. This document proposes GRE tunnel fragmentation
> > > which avoids these pitfalls..
> > >
> > >
> >
> > _______________________________________________
> > Int-area mailing list
> > [email protected]
> > https://www.ietf.org/mailman/listinfo/int-area
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