[Bug 1604617] Re: dhclient does not send fqdn.fqdn for DHCPv6

[Coops]

This issue occurs in Ubuntu 18.04.04 (dhclient 4.3.5), but at some point
by Ubuntu 20.04 beta (dhclient 4.4.1) it seems to now be resolved.

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https://bugs.launchpad.net/bugs/1604617

Title:
  dhclient does not send fqdn.fqdn for DHCPv6

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  ISC DHCP's dynamic DNS updates rely on the fqdn.fqdn option being sent
  in order to work for DHCPv6.  This used to be done in Ubuntu, as shown
  in bugs #991360 and #108862, and all my Windows hosts send it.
  However this was removed in Ubuntu due to a regression in IPv4
  functionality.

  As IPv6 is more widely deployed these days, this regression in IPv6 should be fixed.  This bug is
  current as of Ubuntu 16.04 LTS.

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