What we need is an interdomain routing system that can either (a) drastically reduce the incremental cost of additional prefixes in the DFZ, or (b) move the exist cost out of the DFZ to the people who want to multihome. Both probably mean ditching BGP4 and moving to some sort of inter-AS MPLS scheme, but it will never see the light of day unless it allows leaving hosts and intra-site routing intact (i.e. hop-by-hop routing and a single prefix per site). This last is why shim6 is DOA.
or... drop the idea of "A"/"THE" default free zone and recognize that the concept is based on a flawed assumption. --bill
S
Stephen Sprunk "Stupid people surround themselves with smart CCIE #3723 people. Smart people surround themselves with K5SSS smart people who disagree with them." --Aaron Sorkin