* some code be added in those entities (hosts, customer edge routers, ISP gateways) which claim compatibility with the new address format. This code would have to be be carefully specified but, dealing with only a few simple concepts, would not be voluminous. It would maintain upward compatibility with all other existing coexistence tools.
-- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings