- If the client had multiple addresses, and one expired (was not renewed

- If the client had multiple addresses, and one expired (was not renewed
  by the server), the client would continue to attempt to renew the same
  old address over and over.  Now, the client will omit any expired
  addresses from future Confirm, Renew, or Rebind messages.  [ISC-Bugs #17266]
- dhclient -6 will now select renew/rebind timers based upon the longest
  address expiration time rather than the shortest expiration time, in
  order to avoid cascading renewals in the event a server elects not to
  extend one of multiple IAADDR leases.  [ISC-Bugs #17266]