V6 - Don't do it wrong
Habits die hard, and the concepts of address allocation which are perfectly valid for IPv4 just don't work for IPv6, and in fact some IPv4 habits will technically break IPv6 routing efficiency.
This is a summary of good address allocation hygiene when people have large blocks to split up, based on RFC suggestions and fifteen years of operational experience in IPv6
Speaker Alex Latzko - DEFT.COM