Re: draft-ietf-v6ops-mech-v2-00.txt

[Erik Nordmark <Erik.Nordmark@sun.com>]

> Two possible applications for the optional padding are:
> 
>   1) traffic confidentiality
>   2) path MTU probing using arbitrary data packets
> 
> Moreover, I see no requirement that a decapsulator check that
> IPv4_len = IPv6_len + 60. To be sure, the only requirement
> for correct operation is that IPv4_len >= IPv6_len +60.

To allow padding to be applied in the future the key thing for this
spec is to make it clear that the decapsulator must do the second check
above. I'll add that, but I don't think we need to say something specific 
about the encapsulator adding padding.

  Erik