IPv6 General Prefix

Hi Rene and staff,
just a typo in the first stanza: it is 16 bits instead 12 bits, is not it ?

But my question is about the way to change general-prefix
The lesson use the no form to suppress manually the old general-prefix
So i wonder

  1. can R1 configure a validtime for a general-prefix, then it could be suppressed automatically ?
  2. can the ISP router give a validtime for the general prefix that R1 could interpret ?
    In the router advertisement message format i dont find any field for transmitting this information neither in option. Could a DHCPv6 option do this ?

I wonder another question about preferred time and valid time for IPV6 address. Where could i configure different values from the default ? i google this a little but i do not find anything about a way to do this

Regards

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