In some email I received from Jason R Thorpe, sie wrote:
> On Mon, Jul 03, 2000 at 10:55:41AM +0900, itojun@iijlab.net wrote:
> 
>  > 	another question: how can we know that "gif" is available in the
>  > 	kernel as cloning pseudo-device?  it does not show up on dmesg,
>  > 	nor netstat -in, nor ifconfig -a. (showing it in boot message is the
>  > 	easiest thing to do, of course)
> 
> ifconfig gif0 create would fail.  I suppose we could print messages
> from the pseudo-device attach routines.  Or have some other way for
> ifconfig to get a list of available cloners.

Add another interface flag - IFF_CLONING ?

Darren