radvd and network renumbering

[Frederic Beck <frederic.beck@loria.fr>]

Hello

now that my IPv6/IPv4 works fine (thanks for your help), i would try
renumbering my network.

to do so, i follow the usual steps : 
1. i advertise the two prefixes -> 2 IPv6 adresses on my clients
2. i advertise the old prefix with AdvValidLifetime and
AdvPreferredLifetime set to 0
3. I do not advertise anymore the old prefix

At that state, is shouldn't have any adress with the old prefix on my
hosts, but they are still present.

Am i missing something, like an option in radvd.conf ?

thanks
Fred