** 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
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https://bugs.launchpad.net/bugs/1964494
Title:
Setting DuplicateAddressDetection=none doesn't disable DAD for link-
local IPs
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