alternatives to private RFC-1918 addresses on public routers

When I complain, I prefer to suggest alternatives. In this case, the two that come to mind are: 1) unnumbered interfaces. I've used these with PPP for years, but as I remember, there was a problem with Ciscos. Has this been fixed? 2) host routes. Rather than creating /30 subnets for links (wasting 2 addresses for each 2 used on a link), go all the way and use /32 for each address. This make the local routing table a bit bigger, but the entries are rarely used, and aggregated at the boundaries. Thoughts? Isn't there a link around somewhere on this? What about a link for bogon filters to use at boundaries? WSimpson@UMich.edu Key fingerprint = 17 40 5E 67 15 6F 31 26 DD 0D B9 9B 6A 15 2C 32