Hello Arjen,
most likely, your DHCPv6 client implementation is faulty and you should
probably file a bug for more than one reason.
If the DHCPv6 server sends values for T1 and / or T2 which are valid the
client must honor them and not try to be "smart" about lifetimes of
addresses.
Besides you also get addresses with higher values for preferred lifetime
using RAs so you always have usable IPv6 addresses, so if your
network-manager / OS behaves sanely you shouldn't have any issues.
A work-around for this is setting:
option ra_management 0
in the lan-section of /etc/config/dhcp which will cause most clients to
not use DHCPv6 and rely on RAs only.
Cheers,
Steven
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