- add functions to set previously stored IPv6 addresses on startup and get
them at shutdown; store them in client->ia_na
- write more test cases
- - implement and do duplicate address detection, see rfc 4862, 5.4.
- implement reconfigure support, see 5.3., 15.11. and 22.20.
- implement support for temporary adressess (IA_TA)
- implement dhcpv6 authentication