These patches are present in v257, which we have in plucky.
** Changed in: systemd (Ubuntu)
Status: New => Fix Released
** Changed in: systemd (Ubuntu Plucky)
Status: Won't Fix => Fix Released
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https://bugs.launchpad.net/bugs/2098183
Title:
Preserve IPv6 configurations when `KeepConfiguration=dhcp-on-stop` is
set
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Focal:
New
Status in systemd source package in Jammy:
New
Status in systemd source package in Noble:
Incomplete
Status in systemd source package in Oracular:
Incomplete
Status in systemd source package in Plucky:
Fix Released
Bug description:
[Impact]
The IPv6 configuration is being cleared even though `KeepConfiguration` is
set to `yes`, causing the iSCSI backend system to hang during shutdown.
[Fix]
Systemd upstream has addressed this issue.
https://github.com/systemd/systemd/pull/34989
[Test Plan]
<Verify the functionality of KeepConfiguration in preserving IPv6
configurations>
1. Set up a machine with an iSCSI backend in an IPv6-only environment.
2. Configure the `KeepConfiguration` option for each network device
individually using drop-in configuration files (e.g.,
`/etc/systemd/network/*.network.d/*.conf`) or set the `"critical"` option to
`true` in the Netplan configuration.
3. Power off the machine and verify that the system does not hang.
<Verify the serialization and deserialization functionality in the
systemd-networkd service>
1. Enable debugging for systemd-networkd
mkdir -p /etc/systemd/system/systemd-networkd.service.d/
vim /etc/systemd/system/systemd-networkd.service.d/10-debug.conf
===
[Service]
Environment=SYSTEMD_LOG_LEVEL=debug
===
systemctl daemon-reload
2. Restart the systemd-networkd service twice using the `systemctl restart
systemd-networkd` command.
3. Confirm that serialization and deserialization are functioning correctly
by checking `/var/log/syslog`
2025-03-13T00:35:01.540134+00:00 oracular systemd-networkd[2998]:
Serializing...
2025-03-13T00:35:01.540165+00:00 oracular systemd-networkd[2998]: enp0s9:
Serializing DHCPv4 address (configured): 10.0.2.100/24 broadcast 10.0.2.255
(valid forever, preferred forever), flags: permanent, scope: global, label: n/a
2025-03-13T00:35:01.540193+00:00 oracular systemd-networkd[2998]: enp0s9:
Serializing DHCPv6 address (configured):
2603:c020:4016:8201:48ee:6b22:d3e4:2e8/128 (valid for 1d 56min 49s, preferred
for 23h 56min 49s), flags: no-prefixroute, scope: global
2025-03-13T00:35:01.540218+00:00 oracular systemd-networkd[2998]:
Serialization completed.
...
2025-03-13T00:35:01.596591+00:00 oracular systemd-networkd[3029]:
Deserializing...
2025-03-13T00:35:01.596612+00:00 oracular systemd-networkd[3029]: enp0s9:
Deserialized DHCPv4 address (configured): 10.0.2.100/24 broadcast 10.0.2.255
(valid forever, preferred forever), flags: permanent, scope: global, label: n/a
2025-03-13T00:35:01.596635+00:00 oracular systemd-networkd[3029]: enp0s9:
Deserialized DHCPv6 address (configured):
2603:c020:4016:8201:48ee:6b22:d3e4:2e8/128 (valid for 1d 56min 49s, preferred
for 23h 56min 49s), flags: no-prefixroute, scope: global
2025-03-13T00:35:01.596662+00:00 oracular systemd-networkd[3029]:
Deserialization completed.
[Where problems could occur]
The patches introduce network serialization and deserialization behavior,
ensuring that DHCPv6 addresses are preserved when `KeepConfiguration=yes` is
set. If any regressions occur, error messages may appear when restarting
`systemd-networkd`, but they will be ignored. Both IPv4/IPv6 configuration and
the IPv6 connection may be affected.
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