This has probably been said before, but it makes me uncomfortable to think of everybody in the world being given /48 subnets by default. All of a sudden that wide expanse of 2^128 IP addresses shrinks to 2^48 sites. Sure that's still 65535 times more than 2^32 IPv4 addresses, but wouldn't it be wise to apply some conservatism now to allow the IPv6 address space to last for many more years? After all, there are only 4 bits of IP version field so the basic packet format won't last forever. Jonathon This email and attachments: are confidential; may be protected by privilege and copyright; if received in error may not be used,copied, or kept; are not guaranteed to be virus-free; may not express the views of Kordia(R); do not designate an information system; and do not give rise to any liability for Kordia(R).