Hi.

Current implementation of GRE uses IFT_OTHER type in if_gre.c.
This is not good for permanent use, because it's so ambiguous and it
might be used with other interfaces, I feel.
GRE must be used as a point-to-point (or point-to-multipoint?) tunnel
interface, of course, but IFT_PPP must not be used.
And also, it may not a good idea to define new type in if_types.h for
GRE interface, although I'm not sure.

How do you feel this?
IMHO, IFT_PROPVIRTUAL may be better? (Sorry, if there are some tipical
meanings of this one.)

Regards.
--
Hitoshi Asaeda