Comment # 2 on bug 986395 from Marius Tomaschewski

(In reply to Christian Deckelmann from comment #0)
> Hi,
> 
> the NFS client is using the privacy IPv6 address to mount from a NFS server.
> This breaks the mount when the privacy IPs are renewed periodically
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

They're _not_ renewed, but _deleted_.

Only "normal" non-temporary dhcp6 and auto6 [$prefix:eui64_from_mac]
addresses are renewed.

When the preferred_lft reached 0, a new temp ($prefix:$random) address
is added to the interface (-> for new connections) and the old one gets
a deprecated flag. Once the valid_lft reached 0, an address is deleted.

> Solution could be to implement RFC 5014 in the NFS client application.

Yes, there is also an examples showing the (socket and) getaddrinfo
flags to set causing to filter out or to prefer (as in the example)
temp addresses (e.g. in a web browser) in source address selections.