> > 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.
> [...]
> > How do you feel this?
> > IMHO, IFT_PROPVIRTUAL may be better? (Sorry, if there are some tipical
> > meanings of this one.)
> 
> Why not IFT_GRE?  I think the type should tell you everything you need
> to know to e.g., examine frames using bpfilter.  IFT_PROPVIRTUAL seems
> just as ambiguous as IFT_OTHER in this sense.

Great.

So, I will request to add IFT_GRE in if_types.h as a new type, or I
try to do, if someone doesn't complain to add this new flag.

Thanks.
--
Hitoshi Asaeda