The proposed packages for Noble and Oracular have been tested, and all results are as expected.
[Noble] > apt policy systemd systemd: Installed: 255.4-1ubuntu8.7 Candidate: 255.4-1ubuntu8.7 Version table: *** 255.4-1ubuntu8.7 100 100 http://archive.ubuntu.com/ubuntu noble-proposed/main amd64 Packages 100 /var/lib/dpkg/status 255.4-1ubuntu8.6 500 500 http://iad-ad-3.clouds.archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages 255.4-1ubuntu8 500 500 http://iad-ad-3.clouds.archive.ubuntu.com/ubuntu noble/main amd64 Packages <Verify the functionality of KeepConfiguration in preserving IPv6 configurations> > iscsiadm -m session tcp: [1] [fd00:00c1:0000:0000:0000:0000:a9fe:0002]:3260,1 iqn.2015-02.oracle.boot:uefi (non-flash) <Verify the serialization and deserialization functionality in the systemd-networkd service> 2025-05-31T04:11:43.169341+00:00 chengen-noble systemd-networkd[1325]: Serializing... 2025-05-31T04:11:43.169377+00:00 chengen-noble systemd-networkd[1325]: enp0s5: Serializing DHCPv4 address (configured): 10.0.2.86/24 broadcast 10.0.2.255 (valid forever, preferred forever), flags: permanent, scope: global, label: n/a 2025-05-31T04:11:43.169400+00:00 chengen-noble systemd-networkd[1325]: enp0s5: Serializing NDisc route (configured): dst: n/a, src: n/a, gw: fe80::200:17ff:fed4:8801, prefsrc: n/a, scope: global, table: main(254), proto: ra, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.169424+00:00 chengen-noble systemd-networkd[1325]: enp0s5: Serializing DHCPv4 route (configured): dst: 169.254.169.254/32, src: n/a, gw: n/a, prefsrc: 10.0.2.86, scope: link, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.169443+00:00 chengen-noble systemd-networkd[1325]: enp0s5: Serializing DHCPv4 route (configured): dst: 169.254.0.0/16, src: n/a, gw: n/a, prefsrc: 10.0.2.86, scope: link, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.169465+00:00 chengen-noble systemd-networkd[1325]: enp0s5: Serializing DHCPv4 route (configured): dst: 10.0.2.1/32, src: n/a, gw: n/a, prefsrc: 10.0.2.86, scope: link, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.169487+00:00 chengen-noble systemd-networkd[1325]: enp0s5: Serializing DHCPv4 route (configured): dst: n/a, src: n/a, gw: 10.0.2.1, prefsrc: 10.0.2.86, scope: global, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.169510+00:00 chengen-noble systemd-networkd[1325]: enp0s5: Serializing NDisc route (configured): dst: 2603:c020:4016:8201::/64, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table: main(254), proto: ra, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.169581+00:00 chengen-noble systemd-networkd[1325]: Serialization completed. ... 2025-05-31T04:11:43.214024+00:00 chengen-noble systemd-networkd[1333]: Deserializing... 2025-05-31T04:11:43.214050+00:00 chengen-noble systemd-networkd[1333]: enp0s5: Deserialized DHCPv4 address (configured): 10.0.2.86/24 broadcast 10.0.2.255 (valid forever, preferred forever), flags: permanent, scope: global, label: n/a 2025-05-31T04:11:43.214075+00:00 chengen-noble systemd-networkd[1333]: enp0s5: Deserialized NDisc route (configured): dst: n/a, src: n/a, gw: fe80::200:17ff:fed4:8801, prefsrc: n/a, scope: global, table: main(254), proto: ra, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.214121+00:00 chengen-noble systemd-networkd[1333]: enp0s5: Deserialized DHCPv4 route (configured): dst: 169.254.169.254/32, src: n/a, gw: n/a, prefsrc: 10.0.2.86, scope: link, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.214141+00:00 chengen-noble systemd-networkd[1333]: enp0s5: Deserialized DHCPv4 route (configured): dst: 169.254.0.0/16, src: n/a, gw: n/a, prefsrc: 10.0.2.86, scope: link, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.214160+00:00 chengen-noble systemd-networkd[1333]: enp0s5: Deserialized DHCPv4 route (configured): dst: 10.0.2.1/32, src: n/a, gw: n/a, prefsrc: 10.0.2.86, scope: link, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.214181+00:00 chengen-noble systemd-networkd[1333]: enp0s5: Deserialized DHCPv4 route (configured): dst: n/a, src: n/a, gw: 10.0.2.1, prefsrc: 10.0.2.86, scope: global, table: main(254), proto: dhcp, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.214201+00:00 chengen-noble systemd-networkd[1333]: enp0s5: Deserialized NDisc route (configured): dst: 2603:c020:4016:8201::/64, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table: main(254), proto: ra, type: unicast, nexthop: 0, priority: 100, flags: n/a 2025-05-31T04:11:43.214219+00:00 chengen-noble systemd-networkd[1333]: Deserialization completed. <Verify that the IP address is removed when KeepConfiguration=no is set> > ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host noprefixroute valid_lft forever preferred_lft forever 2: enp0s5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP group default qlen 1000 link/ether 02:00:17:09:d1:42 brd ff:ff:ff:ff:ff:ff inet 10.0.2.86/24 metric 100 brd 10.0.2.255 scope global dynamic enp0s5 valid_lft 86395sec preferred_lft 86395sec inet6 fe80::17ff:fe09:d142/64 scope link valid_lft forever preferred_lft forever > systemctl stop systemd-networkd.socket > systemctl stop systemd-networkd > ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host noprefixroute valid_lft forever preferred_lft forever 2: enp0s5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP group default qlen 1000 link/ether 02:00:17:09:d1:42 brd ff:ff:ff:ff:ff:ff inet6 fe80::17ff:fe09:d142/64 scope link valid_lft forever preferred_lft forever [Oracular] > apt policy systemd systemd: Installed: 256.5-2ubuntu3.2 Candidate: 256.5-2ubuntu3.2 Version table: *** 256.5-2ubuntu3.2 100 100 http://archive.ubuntu.com/ubuntu oracular-proposed/main amd64 Packages 100 /var/lib/dpkg/status 255.4-1ubuntu8.6 500 500 http://iad-ad-3.clouds.archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages 255.4-1ubuntu8 500 500 http://iad-ad-3.clouds.archive.ubuntu.com/ubuntu noble/main amd64 Packages <Verify the functionality of KeepConfiguration in preserving IPv6 configurations> > iscsiadm -m session tcp: [1] [fd00:00c1:0000:0000:0000:0000:a9fe:0002]:3260,1 iqn.2015-02.oracle.boot:uefi (non-flash) <Verify the serialization and deserialization functionality in the systemd-networkd service> 2025-05-31T04:11:44.553253+00:00 chengen-oracular systemd-networkd[1343]: Serializing... 2025-05-31T04:11:44.553273+00:00 chengen-oracular systemd-networkd[1343]: enp0s5: Serializing DHCPv4 address (configured): 10.0.2.146/24 broadcast 10.0.2.255 (valid forever, preferred forever), flags: permanent,no-prefixroute, scope: global, label: n/a 2025-05-31T04:11:44.553295+00:00 chengen-oracular systemd-networkd[1343]: enp0s5: Serializing DHCPv4 route (configuring,configured): dst: 169.254.0.0/16, src: n/a, gw: n/a, prefsrc: 10.0.2.146, table: main(254), priority: 100, proto: dhcp, scope: link, type: unicast, flags: n/a 2025-05-31T04:11:44.553319+00:00 chengen-oracular systemd-networkd[1343]: enp0s5: Serializing DHCPv4 route (configuring,configured): dst: 10.0.2.1/32, src: n/a, gw: n/a, prefsrc: 10.0.2.146, table: main(254), priority: 100, proto: dhcp, scope: link, type: unicast, flags: n/a 2025-05-31T04:11:44.553338+00:00 chengen-oracular systemd-networkd[1343]: enp0s5: Serializing DHCPv4 route (configuring,configured): dst: n/a, src: n/a, gw: 10.0.2.1, prefsrc: 10.0.2.146, table: main(254), priority: 100, proto: dhcp, scope: global, type: unicast, flags: n/a 2025-05-31T04:11:44.553357+00:00 chengen-oracular systemd-networkd[1343]: enp0s5: Serializing DHCPv4 route (configuring,configured): dst: 169.254.169.254/32, src: n/a, gw: n/a, prefsrc: 10.0.2.146, table: main(254), priority: 100, proto: dhcp, scope: link, type: unicast, flags: n/a 2025-05-31T04:11:44.553376+00:00 chengen-oracular systemd-networkd[1343]: Serialization completed. ... 2025-05-31T04:11:44.608519+00:00 chengen-oracular systemd-networkd[1357]: Deserializing... 2025-05-31T04:11:44.608546+00:00 chengen-oracular systemd-networkd[1357]: enp0s5: Deserialized DHCPv4 address (configured): 10.0.2.146/24 broadcast 10.0.2.255 (valid forever, preferred forever), flags: permanent,no-prefixroute, scope: global, label: n/a 2025-05-31T04:11:44.608577+00:00 chengen-oracular systemd-networkd[1357]: enp0s5: Deserialized DHCPv4 route (configured): dst: 169.254.0.0/16, src: n/a, gw: n/a, prefsrc: 10.0.2.146, table: main(254), priority: 100, proto: dhcp, scope: link, type: unicast, flags: n/a 2025-05-31T04:11:44.608604+00:00 chengen-oracular systemd-networkd[1357]: enp0s5: Deserialized DHCPv4 route (configured): dst: 10.0.2.1/32, src: n/a, gw: n/a, prefsrc: 10.0.2.146, table: main(254), priority: 100, proto: dhcp, scope: link, type: unicast, flags: n/a 2025-05-31T04:11:44.608630+00:00 chengen-oracular systemd-networkd[1357]: enp0s5: Deserialized DHCPv4 route (configured): dst: n/a, src: n/a, gw: 10.0.2.1, prefsrc: 10.0.2.146, table: main(254), priority: 100, proto: dhcp, scope: global, type: unicast, flags: n/a 2025-05-31T04:11:44.608657+00:00 chengen-oracular systemd-networkd[1357]: enp0s5: Deserialized DHCPv4 route (configured): dst: 169.254.169.254/32, src: n/a, gw: n/a, prefsrc: 10.0.2.146, table: main(254), priority: 100, proto: dhcp, scope: link, type: unicast, flags: n/a 2025-05-31T04:11:44.608683+00:00 chengen-oracular systemd-networkd[1357]: Deserialization completed. <Verify that the IP address is removed when KeepConfiguration=no is set> > ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host noprefixroute valid_lft forever preferred_lft forever 2: enp0s5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP group default qlen 1000 link/ether 02:00:17:14:58:b4 brd ff:ff:ff:ff:ff:ff inet 10.0.2.146/24 metric 100 brd 10.0.2.255 scope global dynamic enp0s5 valid_lft 86398sec preferred_lft 86398sec inet6 fe80::17ff:fe14:58b4/64 scope link valid_lft forever preferred_lft forever > systemctl stop systemd-networkd.socket > systemctl stop systemd-networkd > ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host noprefixroute valid_lft forever preferred_lft forever 2: enp0s5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP group default qlen 1000 link/ether 02:00:17:14:58:b4 brd ff:ff:ff:ff:ff:ff inet6 fe80::17ff:fe14:58b4/64 scope link valid_lft forever preferred_lft forever ** Tags removed: verification-needed verification-needed-noble verification-needed-oracular ** Tags added: verification-done verification-done-noble verification-done-oracular -- 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/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: Won't Fix Status in systemd source package in Jammy: Won't Fix Status in systemd source package in Noble: Fix Committed Status in systemd source package in Oracular: Fix Committed 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. <Verify that the IP address is removed when KeepConfiguration=no is set> 1. Check the name of the current network configuration file: > ls /run/systemd/network/ 10-netplan-enp0s9.link 10-netplan-enp0s9.network 2. Create a drop-in directory and override the KeepConfiguration setting: > mkdir -p /etc/systemd/network/10-netplan-enp0s9.network.d > vim /etc/systemd/network/10-netplan-enp0s9.network.d/10-netplan-enp0s9.network.conf === [Network] KeepConfiguration=no === 3. Restart the systemd-networkd service to apply the changes: > systemctl restart systemd-networkd 4. Stop the systemd-networkd service and verify the IP address is dropped: > systemctl stop systemd-networkd > ip a [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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