[Bug 1945888] Re: DHCPv6 too strict when the response is missing IAID for some sections

[Ubuntu Foundations Team Bug Bot]

The attachment "Cherry-pick from upstream" seems to be a patch.  If it
isn't, please remove the "patch" flag from the attachment, remove the
"patch" tag, and if you are a member of the ~ubuntu-reviewers,
unsubscribe the team.

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** Tags added: patch

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Title:
  DHCPv6 too strict when the response is missing IAID for some sections

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Systemd incorrectly ignores whole messages when IAID is missing for some sections.
  This has been reported upstream [1] and fixed [2].

  $ lsb_release -rd
  Description:    Ubuntu 21.04
  Release:        21.04

   $ apt-cache policy systemd
  systemd:
    Installed: 247.3-3ubuntu3.6
    Candidate: 247.3-3ubuntu3.6
    Version table:
   *** 247.3-3ubuntu3.6 500
          500 http://no.archive.ubuntu.com/ubuntu hirsute-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       247.3-3ubuntu3.4 500
          500 http://security.ubuntu.com/ubuntu hirsute-security/main amd64 Packages
       247.3-3ubuntu3 500
          500 http://no.archive.ubuntu.com/ubuntu hirsute/main amd64 Packages

  
  What is expected to happen is that systemd will ignore only the relevant part of the message, not the entire message. 

  What is happening is that the entire message is ignored, leading to
  DHCP leases not being renewed. This is fairly easy to replicate e.g in
  AWS by enabling both an IPv6 prefix and an IPv6 single address to the
  same interface.

  [1] https://github.com/systemd/systemd/issues/20803
  [2] https://github.com/systemd/systemd/pull/20807

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