Zbyszek: Thank you for your clarification! Dimitri: You are right, on my Ubuntu 16.04 server installations the systemd-networkd service is disabled and the dhclient from the isc-dhcp- client package is used for the DHCP part:
$ systemctl status systemd-networkd.service systemd-networkd.service - Network Service Loaded: loaded (/lib/systemd/system/systemd-networkd.service; disabled; vendor preset: enabled) Active: inactive (dead) Docs: man:systemd-networkd.service(8) $ journalctl | grep -i dhcp ... Aug 28 13:47:55 #### dhclient[995]: Internet Systems Consortium DHCP Client 4.3.3 ... Oct 31 14:33:27 #### dhclient[1355]: DHCPREQUEST of ###.###.###.### on ### to ###.###.###.### port 67 (xid=##########) Oct 31 14:33:27 #### dhclient[1355]: DHCPACK of ###.###.###.### from ###.###.###.### ... $ dpkg --search /sbin/dhclient isc-dhcp-client: /sbin/dhclient -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795921 Title: Out-of-Bounds write in systemd-networkd dhcpv6 option handling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1795921/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs