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IPv6 prefix length.

Hello guys,
  When I try to configure a rule:
    block in quick on $IntIF inet6 from ! $IntIF/64 to any
  I get an error message:
    /etc/pf.conf:115: illegal netmask value /64
  Does this comes from the fact that the interface can have multiple
  addresses there's no way to have one natural address. So do I have
  to specify the IP6? Is there any documentation on how to do
  firewalling in IPv6?
  Because I've been trying and I really couldn't find.
Best regards,
 Alejandro Belluscio