I'm re-opening this for Xenial, moving from Wontfix back to in progress.
This is because while 'normal' dhcpv6 works without this fix because of
the patch to dhclient (see my explanation in comment 23), there is a
special case of using dhclient in 'stateless' mode, i.e. dhclient -6 -S.
In that mode, dhclient does not call its 'PREINIT6' which is where the
wait-for-dad patch was added. When configuring ifupdown in this way,
dhclient still fails due to this bug; e.g.:
auto eth0
iface eth0 inet6 auto
dhcp 1
if eth0 is down, then running ifup eth0 with the above config will
result in dhclient always failing due to this bug.
** Changed in: ifupdown (Ubuntu Xenial)
Status: Won't Fix => In Progress
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https://bugs.launchpad.net/bugs/1447715
Title:
dhclient -6: Can't bind to dhcp address: Cannot assign requested
address
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