On Tue, 2007-05-29 at 10:25 -0700, David Williamson wrote:
Uh, neither of those reasons undermines the solution others have proposed: use PI space. You can always just not announce some part (or all) of your space. That would make it private.
Until there's a magic solution for scalable IDR you'll hit the filter-wall. For ARIN's PI-block (/48 as defined by ARIN), expect networks to filter anything that is more specific. Hence you won't be able to keep a chunk "private" by making it "invisible" to the outside world.
ULA-C sounds to me like a request to the guys who spin silicon to help people keep from screwing up their router configs. If someone can't manage to filter their BGP such that they keep some (or all) of their space private, I don't see why Cisco, Juniper, et al., need to do that for them.
ULA-C is a questionable workaround for the IT-industry's failure to solve basic problems. E.g; why, in 2007, is renumbering even an issue anymore? It shouldn't be a problem when changing upstream provider, nor should it be an issue when different private networks are joined. //per