* 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