[Bug 1800668] [NEW] Clarify MAC and MTU setting requirements

[Mathieu Trudel-Lapierre]

Public bug reported:

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.

** Affects: netplan
     Importance: High
         Status: Fix Committed

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: netplan.io (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: netplan.io (Ubuntu Cosmic)
     Importance: Undecided
         Status: New

** Affects: netplan.io (Ubuntu Disco)
     Importance: Undecided
         Status: New

** Changed in: netplan
       Status: New => Fix Committed

** Changed in: netplan
   Importance: Undecided => High

** Also affects: netplan.io (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: netplan.io (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: netplan.io (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Also affects: netplan.io (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1800668

Title:
  Clarify MAC and MTU setting requirements

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

Bug description:
  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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