[Bug 1738998] Re: netplan does not allow dhcp client identifier type to be specified

[Mathieu Trudel-Lapierre]

It is landed in 18.04; now looking at SRU to older releases:

netplan.io (0.35) bionic; urgency=medium

  * debian/postinst: fix version check for when to write breadcrumbs.
    (LP: #1756742)
  * bonds/bridges: Support specifying time-based values with "ms" suffix when
    the value should be in milliseconds; while keeping support for the previous
    behavior of handling values are pure seconds when no suffix is present.
    (LP: #1745597)
  * IPv6: accept-ra should default to being unset, so that the kernel default
    can be used. (LP: #1732002)
  * DHCPv4: add a "dhcp-identifier: mac" field that can be set to fix interop
    with Windows Server-based DHCP servers which don't support RFC 4361.
    (LP: #1738998)
  * docs, examples: reformat comments in examples, add standalone example files
  * debian/docs, debian/netplan.io.install: install doc and examples in the
    right locations.
  * netplan try: allow users to preview/test and approve network configuration
    changes, and automatically revert if they are not accepted. (LP: #1764824)
  * networkd: don't wipe out /run/netplan on generate: we do want to keep any
    YAML configurations in that directory, we just need to remove generated
    wpasupplicant configs. (LP: #1764869)
  * debian/control: add bash-completion to Build-Depends to make sure we do
    install completion files in the right location.

** Changed in: netplan
       Status: In Progress => Fix Released

** Also affects: nplan (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: nplan (Ubuntu)
       Status: New => Fix Released

** Also affects: nplan (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: nplan (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1738998

Title:
  netplan does not allow dhcp client identifier type to be specified

Status in netplan:
  Fix Released
Status in nplan package in Ubuntu:
  Fix Released
Status in nplan source package in Xenial:
  New
Status in nplan source package in Artful:
  New

Bug description:
  [Impact]
  Users of Ubuntu dealing with a DHCP server based on Windows Server, Solarwinds IPAM, or possibly other DHCP server products that do no support RFC 4361.

  [Test case]
  -- requires a Windows Server DHCP setup, or another product without support for client identifier DUIDs.

  1) Configure a reservation for the device, using the device's MAC address.
  2) Configure the device for DHCP:

  network:
    version: 2
    renderer: networkd
    ethernets:
      eth0:
        dhcp4: yes
        dhcp-identifier: mac

  3) Run 'netplan apply'
  4) Verify that 'netplan apply' completes successfully, and that the expected IP address is received as part of the reservation. It may be required to clear the DHCP server's cache of DHCP requests/responses.

  [Regression potential]
  These DHCP behavior changes may lead to systems not receiving the same IP as they previously did on reservations from a DHCP server; the default is not changing from using DUIDs so unchanged configurations should not be affected at all, but changes to add the new feature will likely change the IP address returned to the client from the DHCP server. Additionally, failure to parse netplan configuration or invalid DHCP behavior should be investigated as possible regressions coming from this SRU.

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