Re: 64share v2

[Philip Homburg <[e-mail]>]

>I don't think that can really happen here because the option we're defining
>is explicitly for a point-to-point link. It's very unlikely that
>point-to-point links won't have some sort of liveness detection already.
>You know if your point-to-point link is up, right?

In theory yes. In practice, people come up with ways of relaying
point-to-point protocols and the link state gets lost.

We can define an option that only works in the narrow context of 3GPP and a 
couple of years later we find that the option is reused in a context where
there is no reliable link state information.

So we should learn from past mistakes and explicitly verify that there
is IPv6 connectivity. Even something as simple as sending an RS if it sees
an RA without the option.