itojun@iijlab.net writes:

> 	i ran some experiment with IPv6, and now I think in_pcbpurgeif() is
> 	incorrect.  it should not leave multicast groups the user application
> 	have joined.

It would be arguable, but probably what we should do is either:

	(1) leave and somehow tell an application so.

or

	(2) re-join automatically somehow.

For (1), how to tell would be a matter.  For (2), how to select an
interface would be a matter.  Using an address which an application is
used to specify interface?  If so, we should join using another
interface if the address is moved to from a interface to another?

enami.