[Bug 1852754] Re: networkd does not complete interface configuration if Link MTUBytes is set

[Steve Langasek]

Hello Dan, or anyone else affected,

Accepted systemd into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.33 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Description changed:

  [impact]
  
  interfaces configured with .network file [Link] section specifying
  MTUBytes will not be successfully brought up.
  
  [test case]
  
  configure interface e.g.
  
  Name=ens3
  
  [Network]
  DHCP=ipv4
  LinkLocalAddressing=ipv6
  
  [Link]
  MTUBytes=1550
  
  start/restart networkd, the interface will never reach 'routable' stage
  and will not get an IPv4 address.
  
  [regression potential]
  
- regressions will likely occur during networkd
+ any regressions would likely occur during networkd
  configuration/startup/restart, and would likely cause failure to
  successfully setup the interface.
  
  [other info]
  
  this is a regression-proposed caused by incomplete backport for bug
  1850704

** Changed in: systemd (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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https://bugs.launchpad.net/bugs/1852754

Title:
  networkd does not complete interface configuration if Link MTUBytes is
  set

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  Fix Committed

Bug description:
  [impact]

  interfaces configured with .network file [Link] section specifying
  MTUBytes will not be successfully brought up.

  [test case]

  configure interface e.g.

  Name=ens3

  [Network]
  DHCP=ipv4
  LinkLocalAddressing=ipv6

  [Link]
  MTUBytes=1550

  start/restart networkd, the interface will never reach 'routable'
  stage and will not get an IPv4 address.

  [regression potential]

  any regressions would likely occur during networkd
  configuration/startup/restart, and would likely cause failure to
  successfully setup the interface.

  [other info]

  this is a regression-proposed caused by incomplete backport for bug
  1850704

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