** 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 <<EOF - [Service] - Environment=SYSTEMD_LOG_LEVEL=debug - EOF - systemctl daemon-reload && systemctl restart systemd-networkd + mkdir -p /etc/systemd/system/systemd-networkd.service.d/ + cat > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf <<EOF + [Service] + Environment=SYSTEMD_LOG_LEVEL=debug + EOF + systemctl daemon-reload && systemctl restart systemd-networkd 3- Configure a link-local address to a network interface on the VM: vi /etc/systemd/network/10-netplan-enp7s0.network # add [Match] Name=enp7s0 [Address] Address=169.254.240.10/24 DuplicateAddressDetection=ipv4 4- Restart services and apply systemctl daemon-reload && systemctl restart systemd-networkd && systemctl restart networkd-dispatcher.service netplan apply 5- Check if DAD is running (it should): journalctl -b -u systemd-networkd --no-pager -o short-precise | grep -i ACD - 6- Set DuplicateAddressDetection=none in + 6- Set DuplicateAddressDetection=none in /etc/systemd/network/10-netplan-enp7s0.network 7- Restart services and apply as in step 4 - 8- Check if DAD is running as in step 5 (it shouldn't, but + 8- Check if DAD is running as in step 5 (it shouldn't, but it's there) - After step 7 DAD should be disabled as expected and it - shouldn't be executed when running 'netplan apply' but + After step 7 DAD should be disabled as expected and it + shouldn't be executed when running 'netplan apply' but it is actually executed. - I think this commit [1] may be related (landed in systemd - v249). I've also tested the out-of-the-box systemd versions - for Focal and Impish but there I can effectively disable - DAD. If the IPs are set to non-link local addresses then - the problem is not observed anymore. + I think this commit [1] may be related (landed in systemd + v249). I've also tested the out-of-the-box systemd versions + for Focal and Impish but there I can effectively disable + DAD. If the IPs are set to non-link local addresses then + the problem is not observed anymore. - - [1] https://github.com/systemd/systemd/commit/1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e + [1] + https://github.com/systemd/systemd/commit/1cf4ed142d6c1e2b9dc6a0bc74b6a83ae30b0f8e
** Also affects: systemd (Ubuntu Kinetic) Importance: Medium Status: Triaged ** Also affects: systemd (Ubuntu Jammy) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1964494 Title: Setting DuplicateAddressDetection=none doesn't disable DAD for link- local IPs To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1964494/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs