On Tue, Aug 19, 2014 at 4:56 PM, Brian E Carpenter <
[email protected]> wrote:

> > Can we then say that PTB packets < 1280 are invalid and should be ignored
> > by hosts? Or should be ignored unless they are running a SIIT translator?
>
> The host doesn't know in general if there is a translator downstream
> (except in a DNS64/NAT64 scenario).
>

What does "downstream" mean? Do you mean "the host does not know if the
other host it's talking to is behind a SIIT translator"? Or something else?
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