This does *not* appear to resolve a closely related problem where the
link-local address has not yet been assigned. See LP: 1718568
In brief, the loop
case " $out " in
*\ dadfailed\ *)
error "$dev: ipv6 dad failed."
return 1;;
*\ tentative\ *) :;;
*) return 0;;
esac
exits with 'return 0' with the lack of a link-local address as " "
($out empty) matches the default pattern as would a valid, link-local
address.
One possible solution is to add "the missing case" that matches $out
being empty that performs the "wait and try again" action.
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https://bugs.launchpad.net/bugs/1633479
Title:
dhclient does not wait for ipv6 dad (duplicate address detection)
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