Not, Marty; the "market reality" is that you do CIDR or people will stop getting PSI's routes. By not doing it you already got screwed routing; the next step is loss of global connectivity, i guess. God bless your customers. Your analogy with 800 portability and IP renumbering is more than artificial. The whole debate about 800 portability rotated around retracting published numbers and loss of investments in advertisements. So far i didn't hear anyone publishing IP numbers in their ads. Changing providers *always* involves some expenses and probably disruption of service. Also, nobody was really interested in renumbering technology in pre-CIDR times; now market will force software vendors to provide network number discovery as a standard feature. The host portability problem is not new -- the mobile communications folks worked on it for quite a time; but it wasn't anywhere near the interest field of regular TCP/IP community. Now it is -- as well as IPNG, video and security. New times, new problems. --vadim