Package: kea-dhcp4-server Version: 2.6.3-1 Severity: normal If networking.service is restarted (needrestart defaults to not restarting it but will list it in the services that need to restart to take the current configuration) then kea-dhcp4 won't work after that until it is restarted.
I expect that the system will just sort it out. kea-dhcp4-server.service could be restarted by systemd as a dependency on networking it systemd was setup in that way. The kea process could just notice that the interface went down and up and it could reonfigure itself. A final option would be for the daemon to recognise it as a fatal error condition and abort in which case systemd would restart it and the service would end up in a good state. Below are the relevant logs of a system where this happened: Jul 22 13:18:27 usagi systemd[1]: Stopping networking.service - Raise network interfaces... Jul 22 13:18:27 usagi kea-dhcp4[3427066]: 2025-07-22 13:18:27.636 ERROR [kea-dhcp4.packets/3427066.139656111945664] DHCP4_BUFFER_RECEIVE_FAIL error on attempt to receive packet: Pkt4FilterLpf to receive UDP4 data Jul 22 13:18:28 usagi systemd[1]: networking.service: Deactivated successfully. Jul 22 13:18:28 usagi systemd[1]: Stopped networking.service - Raise network interfaces. Jul 22 13:18:28 usagi systemd[1]: networking.service: Consumed 2min 32.148s CPU time, 40.8M memory peak. Jul 22 13:18:28 usagi systemd[1]: Starting networking.service - Raise network interfaces... Jul 22 13:19:08 usagi systemd[1]: Finished networking.service - Raise network interfaces. After that there were no log entries about DHCP requests being received, so the service was not operating. -- System Information: Debian Release: 13.0 Architecture: amd64 (x86_64) Kernel: Linux 6.12.32-amd64 (SMP w/44 CPU threads; PREEMPT) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU:en Shell: /bin/sh linked to /usr/bin/dash Init: unable to detect Versions of packages kea-dhcp4-server depends on: ii init-system-helpers 1.68 ii kea-common 2.6.3-1 ii libc6 2.41-10 ii libgcc-s1 14.2.0-19 ii libstdc++6 14.2.0-19 kea-dhcp4-server recommends no packages. Versions of packages kea-dhcp4-server suggests: pn kea-doc <none> -- Configuration Files: /etc/kea/kea-dhcp4.conf [Errno 13] Permission denied: '/etc/kea/kea-dhcp4.conf' -- debconf-show failed
