[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Dan Streetman]

marked verified per comment 10

** Tags removed: verification-needed verification-needed-jammy
** Tags added: verification-done verification-done-jammy

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Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Jammy:
  Fix Committed
Status in systemd source package in Kinetic:
  Fix Released

Bug description:
  [impact]

  manual disabling of ipv4 DAD (IACD) for static link-local address does
  not work in jammy

  [test case]

  see 'Reproducer' in original description below

  [regression potential]

  failure to disable DAD, or incorrect disabling of DAD, or networkd
  issues around parsing of DAD config parsing

  [scope]

  this is needed for j and k

  introduced upstream by commit
  1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e, first included in v249, so
  this bug does not affect impish or earlier

  fixed upstream by commit 2859932bd64d61a89f85fa027762bc16961fcf53

  [original description]

  A customer reported network disconnections on their storage
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate
  Address Detection (DAD) mechanism was delaying the interfaces
  from coming back up.

  As a workaround we tried to disable DAD for the interfaces
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a
  .network file added to /etc/systemd/network/ doesn't really
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

    mkdir -p /etc/systemd/system/systemd-networkd.service.d/
    cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Alejandro Santoyo Gonzalez]

Tested 249.11-0ubuntu3.3 and DuplicateAddressDetection is now honored as
expected. No other issues were observed.

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Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Jammy:
  Fix Committed
Status in systemd source package in Kinetic:
  Fix Released

Bug description:
  [impact]

  manual disabling of ipv4 DAD (IACD) for static link-local address does
  not work in jammy

  [test case]

  see 'Reproducer' in original description below

  [regression potential]

  failure to disable DAD, or incorrect disabling of DAD, or networkd
  issues around parsing of DAD config parsing

  [scope]

  this is needed for j and k

  introduced upstream by commit
  1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e, first included in v249, so
  this bug does not affect impish or earlier

  fixed upstream by commit 2859932bd64d61a89f85fa027762bc16961fcf53

  [original description]

  A customer reported network disconnections on their storage
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate
  Address Detection (DAD) mechanism was delaying the interfaces
  from coming back up.

  As a workaround we tried to disable DAD for the interfaces
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a
  .network file added to /etc/systemd/network/ doesn't really
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

    mkdir -p /etc/systemd/system/systemd-networkd.service.d/
    cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Steve Langasek]

Hello Alejandro, or anyone else affected,

Accepted systemd into jammy-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/249.11-0ubuntu3.3 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, what testing has been
performed on the package and change the tag from verification-needed-
jammy to verification-done-jammy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-jammy. 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.

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

** Tags added: verification-needed verification-needed-jammy

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Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Jammy:
  Fix Committed
Status in systemd source package in Kinetic:
  Fix Released

Bug description:
  [impact]

  manual disabling of ipv4 DAD (IACD) for static link-local address does
  not work in jammy

  [test case]

  see 'Reproducer' in original description below

  [regression potential]

  failure to disable DAD, or incorrect disabling of DAD, or networkd
  issues around parsing of DAD config parsing

  [scope]

  this is needed for j and k

  introduced upstream by commit
  1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e, first included in v249, so
  this bug does not affect impish or earlier

  fixed upstream by commit 2859932bd64d61a89f85fa027762bc16961fcf53

  [original description]

  A customer reported network disconnections on their storage
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate
  Address Detection (DAD) mechanism was delaying the interfaces
  from coming back up.

  As a workaround we tried to disable DAD for the interfaces
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a
  .network file added to /etc/systemd/network/ doesn't really
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

    mkdir -p /etc/systemd/system/systemd-networkd.service.d/
    cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 249.11-0ubuntu4

---
systemd (249.11-0ubuntu4) kinetic; urgency=medium

  * d/p/lp1964494-network-do-not-enable-IPv4-ACD-for-IPv4-link-local-a.patch:
do not enable IPv4 ACD for IPv4 link-local address if ACD is
disabled explicitly (LP: #1964494)

 -- Dan Streetman   Tue, 31 May 2022 08:25:36 -0400

** Changed in: systemd (Ubuntu Kinetic)
   Status: Fix Committed => Fix Released

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Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Jammy:
  In Progress
Status in systemd source package in Kinetic:
  Fix Released

Bug description:
  [impact]

  manual disabling of ipv4 DAD (IACD) for static link-local address does
  not work in jammy

  [test case]

  see 'Reproducer' in original description below

  [regression potential]

  failure to disable DAD, or incorrect disabling of DAD, or networkd
  issues around parsing of DAD config parsing

  [scope]

  this is needed for j and k

  introduced upstream by commit
  1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e, first included in v249, so
  this bug does not affect impish or earlier

  fixed upstream by commit 2859932bd64d61a89f85fa027762bc16961fcf53

  [original description]

  A customer reported network disconnections on their storage
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate
  Address Detection (DAD) mechanism was delaying the interfaces
  from coming back up.

  As a workaround we tried to disable DAD for the interfaces
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a
  .network file added to /etc/systemd/network/ doesn't really
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

    mkdir -p /etc/systemd/system/systemd-networkd.service.d/
    cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Lukas Märdian]

** Changed in: systemd (Ubuntu Kinetic)
   Status: Triaged => Fix Committed

** Changed in: systemd (Ubuntu Jammy)
   Status: New => In Progress

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https://bugs.launchpad.net/bugs/1964494

Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Committed
Status in systemd source package in Jammy:
  In Progress
Status in systemd source package in Kinetic:
  Fix Committed

Bug description:
  [impact]

  manual disabling of ipv4 DAD (IACD) for static link-local address does
  not work in jammy

  [test case]

  see 'Reproducer' in original description below

  [regression potential]

  failure to disable DAD, or incorrect disabling of DAD, or networkd
  issues around parsing of DAD config parsing

  [scope]

  this is needed for j and k

  introduced upstream by commit
  1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e, first included in v249, so
  this bug does not affect impish or earlier

  fixed upstream by commit 2859932bd64d61a89f85fa027762bc16961fcf53

  [original description]

  A customer reported network disconnections on their storage
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate
  Address Detection (DAD) mechanism was delaying the interfaces
  from coming back up.

  As a workaround we tried to disable DAD for the interfaces
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a
  .network file added to /etc/systemd/network/ doesn't really
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

    mkdir -p /etc/systemd/system/systemd-networkd.service.d/
    cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Lukas Märdian]

This SRU should be combined with LP: #1969375 as uploaded in
249.11-0ubuntu3.3 (containing some more autopkgtest related changes)

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Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Triaged
Status in systemd source package in Jammy:
  New
Status in systemd source package in Kinetic:
  Triaged

Bug description:
  [impact]

  manual disabling of ipv4 DAD (IACD) for static link-local address does
  not work in jammy

  [test case]

  see 'Reproducer' in original description below

  [regression potential]

  failure to disable DAD, or incorrect disabling of DAD, or networkd
  issues around parsing of DAD config parsing

  [scope]

  this is needed for j and k

  introduced upstream by commit
  1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e, first included in v249, so
  this bug does not affect impish or earlier

  fixed upstream by commit 2859932bd64d61a89f85fa027762bc16961fcf53

  [original description]

  A customer reported network disconnections on their storage
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate
  Address Detection (DAD) mechanism was delaying the interfaces
  from coming back up.

  As a workaround we tried to disable DAD for the interfaces
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a
  .network file added to /etc/systemd/network/ doesn't really
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

    mkdir -p /etc/systemd/system/systemd-networkd.service.d/
    cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Dan Streetman]

** Description changed:

- A customer reported network disconnections on their storage 
+ [impact]
+ 
+ manual disabling of ipv4 DAD (IACD) for static link-local address does
+ not work in jammy
+ 
+ [test case]
+ 
+ see 'Reproducer' in original description below
+ 
+ [regression potential]
+ 
+ failure to disable DAD, or incorrect disabling of DAD, or networkd
+ issues around parsing of DAD config parsing
+ 
+ [scope]
+ 
+ this is needed for j and k
+ 
+ introduced upstream by commit 1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e,
+ first included in v249, so this bug does not affect impish or earlier
+ 
+ fixed upstream by commit 2859932bd64d61a89f85fa027762bc16961fcf53
+ 
+ [original description]
+ 
+ A customer reported network disconnections on their storage
  servers when running 'netplan apply'. The culprit was that
- they have link-local addresses configured and the Duplicate 
- Address Detection (DAD) mechanism was delaying the interfaces 
- from coming back up. 
+ they have link-local addresses configured and the Duplicate
+ Address Detection (DAD) mechanism was delaying the interfaces
+ from coming back up.
  
- As a workaround we tried to disable DAD for the interfaces 
+ As a workaround we tried to disable DAD for the interfaces
  but that's not working in Ubuntu 22.04:
  
  I've noticed that setting DuplicateAddressDetection=none for an
- interface with a link-local address (e.g., 169.254.*) via a 
- .network file added to /etc/systemd/network/ doesn't really 
+ interface with a link-local address (e.g., 169.254.*) via a
+ .network file added to /etc/systemd/network/ doesn't really
  disable Duplicate Address Detection.
  
  OS and package versions:
  
-  - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
-  - systemd 249.5-2ubuntu4
+  - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
+  - systemd 249.5-2ubuntu4
  
  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:
  
-   mkdir -p /etc/systemd/system/systemd-networkd.service.d/
-   cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf < /etc/systemd/system/systemd-networkd.service.d/10-debug.conf  /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Bug Watch Updater]

** Changed in: systemd
   Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1964494

Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  A customer reported network disconnections on their storage 
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate 
  Address Detection (DAD) mechanism was delaying the interfaces 
  from coming back up. 

  As a workaround we tried to disable DAD for the interfaces 
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a 
  .network file added to /etc/systemd/network/ doesn't really 
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

mkdir -p /etc/systemd/system/systemd-networkd.service.d/
cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Bug Watch Updater]

** Changed in: systemd
   Status: Unknown => New

-- 
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https://bugs.launchpad.net/bugs/1964494

Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  New
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  A customer reported network disconnections on their storage 
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate 
  Address Detection (DAD) mechanism was delaying the interfaces 
  from coming back up. 

  As a workaround we tried to disable DAD for the interfaces 
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a 
  .network file added to /etc/systemd/network/ doesn't really 
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

mkdir -p /etc/systemd/system/systemd-networkd.service.d/
cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Lukas Märdian]

There is now an upstream fix to keep ACD on by default on ipv4ll
addresses, but still honor the user settings if they are set:
https://github.com/systemd/systemd/pull/22824

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Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Unknown
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  A customer reported network disconnections on their storage 
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate 
  Address Detection (DAD) mechanism was delaying the interfaces 
  from coming back up. 

  As a workaround we tried to disable DAD for the interfaces 
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a 
  .network file added to /etc/systemd/network/ doesn't really 
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

mkdir -p /etc/systemd/system/systemd-networkd.service.d/
cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Lukas Märdian]

Thank you for reporting this. I've forwarded it to the upstream
developers, as I think at very least this new behavior should be
documented in
https://systemd.network/systemd.network.html#DuplicateAddressDetection=

https://github.com/systemd/systemd/issues/22763

** Bug watch added: github.com/systemd/systemd/issues #22763
   https://github.com/systemd/systemd/issues/22763

** Changed in: systemd (Ubuntu)
   Status: Confirmed => Triaged

** Changed in: systemd (Ubuntu)
   Importance: Undecided => Medium

** Also affects: systemd via
   https://github.com/systemd/systemd/issues/22763
   Importance: Unknown
   Status: Unknown

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Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd:
  Unknown
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  A customer reported network disconnections on their storage 
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate 
  Address Detection (DAD) mechanism was delaying the interfaces 
  from coming back up. 

  As a workaround we tried to disable DAD for the interfaces 
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a 
  .network file added to /etc/systemd/network/ doesn't really 
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

mkdir -p /etc/systemd/system/systemd-networkd.service.d/
cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: systemd (Ubuntu)
   Status: New => Confirmed

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Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  A customer reported network disconnections on their storage 
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate 
  Address Detection (DAD) mechanism was delaying the interfaces 
  from coming back up. 

  As a workaround we tried to disable DAD for the interfaces 
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a 
  .network file added to /etc/systemd/network/ doesn't really 
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

mkdir -p /etc/systemd/system/systemd-networkd.service.d/
cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Alejandro Santoyo Gonzalez]

I agree, a user-configured setting should be honored. Another thing to
consider is that according to the Jammy systemd.network man page, the 
default should be 'ipv6' so one would expect that to be a global 
default, but it gets overridden for link-local IPs due to this commit.  


[1] https://manpages.ubuntu.com/manpages/jammy/man5/systemd.network.5.html

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https://bugs.launchpad.net/bugs/1964494

Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd package in Ubuntu:
  New

Bug description:
  A customer reported network disconnections on their storage 
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate 
  Address Detection (DAD) mechanism was delaying the interfaces 
  from coming back up. 

  As a workaround we tried to disable DAD for the interfaces 
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a 
  .network file added to /etc/systemd/network/ doesn't really 
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

mkdir -p /etc/systemd/system/systemd-networkd.service.d/
cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf 

[Touch-packages] [Bug 1964494] Re: Setting DuplicateAddressDetection=none doesn't disable DAD for link-local IPs

[Dan Streetman]

> I think this commit [1] may be related (landed in systemd v249)

yeah, that commit seems to be intentionally forcing ACD on for
statically configured ipv4, i'm not sure quite why, it seems like a
user-configured setting should be honored; but possibly Yu was trying to
default it to on instead of overriding user config.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1964494

Title:
  Setting DuplicateAddressDetection=none doesn't disable DAD for link-
  local IPs

Status in systemd package in Ubuntu:
  New

Bug description:
  A customer reported network disconnections on their storage 
  servers when running 'netplan apply'. The culprit was that
  they have link-local addresses configured and the Duplicate 
  Address Detection (DAD) mechanism was delaying the interfaces 
  from coming back up. 

  As a workaround we tried to disable DAD for the interfaces 
  but that's not working in Ubuntu 22.04:

  I've noticed that setting DuplicateAddressDetection=none for an
  interface with a link-local address (e.g., 169.254.*) via a 
  .network file added to /etc/systemd/network/ doesn't really 
  disable Duplicate Address Detection.

  OS and package versions:
  
   - Description:   Ubuntu Jammy Jellyfish (development branch). Release: 
22.04
   - systemd 249.5-2ubuntu4

  Reproducer:
  ---
  1- Set up Ubuntu 22.04 VM
  2- Increase systemlog level:

mkdir -p /etc/systemd/system/systemd-networkd.service.d/
cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf