*** This bug is a duplicate of bug 1633562 ***
https://bugs.launchpad.net/bugs/1633562
this is also related to bug 1447715 in which i added the DAD wait to
ifupdown. however, since bug 1633479 fixed the issue in dhclient
instead of ifupdown, at around the same time, i marked bug 1447715 as
wontfix, since that ifupdown change was no longer required to get
dhclient working.
But, now with this bug, the side-effect of changing dhclient to do its
'PREINIT6' (as mentioned in last comment) seems to be prohibitive and it
probably is much easier to simply re-open bug 1447715 and push that
ifupdown fix into xenial.
That approach does mean that manual running of dhclient -6 -S will
always fail with an interface that's down (or was brought up immediately
before running dhclient -S, which is what ifupdown does). However,
while manually running dhclient -6 on a currently down interface in
order to both bring it up and get a dhcpv6 address does make sense,
running dhclient -6 -S on a down interface does not really make sense,
since doing that will only get the 'other' network info like DNS server,
and won't actually set up an address on the interface. So I think I
have to agree with the conclusion in bug 1633562, to mark waiting for
dad when manually running dhclient -6 -S as invalid.
So, I'll mark this bug as a dup of that original bug, and I'll re-open
bug 1447715 to push that ifupdown fix into xenial.
** This bug has been marked a duplicate of bug 1633562
'dhclient -6 -S' does not bring interface up
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https://bugs.launchpad.net/bugs/1764478
Title:
dhclient in 'stateless' mode does not wait for ipv6 dad
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