Fred,
If we can't probe a tunnel, we can't do GRE at all. Ever. Not with IPv4, not
with IPv6, not with anything.
MTU issues aside, before activating a tunnel, we must be certain that the
tunnel can carry a 1-byte packet from GRE ingress to egress. If we don't do
that, we risk black-holing traffic. This is why nearly all GRE implementations
have some type of proprietary probing mechanism.
Beyond suggesting that the probing mechanism use a 1280-byte payload, we have
put the details of that probing mechanism out of scope for this document.
Ron
> -----Original Message-----
> From: Templin, Fred L [mailto:[email protected]]
> Sent: Wednesday, April 22, 2015 6:32 PM
> To: Ronald Bonica; [email protected]
> Subject: RE: [Int-area] I-D Action: draft-ietf-intarea-gre-ipv6-07.txt
>
> Hi Ron,
>
> So, this gives way to the following, which may be the best we can do if we
> can't probe:
>
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