[Bug 1800668] Re: Clarify MAC and MTU setting requirements

[Steve Langasek]

A possible SRU regression has been reported against netplan.io
0.96-0ubuntu0.18.10.2 in LP: #1825206.  This version has been rolled
back to -proposed while the investigation is ongoing.

** Changed in: netplan.io (Ubuntu Cosmic)
       Status: Fix Released => Fix Committed

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Title:
  Clarify MAC and MTU setting requirements

Status in netplan:
  Fix Released
Status in netplan.io package in Ubuntu:
  Fix Released
Status in netplan.io source package in Bionic:
  Fix Committed
Status in netplan.io source package in Cosmic:
  Fix Committed
Status in netplan.io source package in Disco:
  Fix Released

Bug description:
  [Impact]
  Documentation for netplan.

  [Test case]
  Run 'man netplan'; validate that the documentation clearly states that setting MTU requires matching by MAC address; under the 'mtu' section.

  [Regression potential]
  None; this is limited to documentation.

  ---

  We already document that you should match by MAC when setting MTU.
  Because MAC addresses are set in the link file as well, they should
  also specify a MAC.

  Also point out that the restriction only applies to networkd.

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