This is not really a bug in systemd-networkd. It just adheres more strictly to the standard.
In this case the DHCP server doesn't send the Option 51 "IP Address Lease Time" in the DHCPOFFER. RFC2131 declares this a MUST (see Table 3: Fields and options used by DHCP servers). I encountered a similar problem where a DHCP server doesn't send the "Server identifier" option. -- 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/1779721 Title: systemd-networkd does not configure DHCPv4 Status in netplan.io package in Ubuntu: Invalid Status in systemd package in Ubuntu: Confirmed Bug description: I have an up-to-date Ubuntu 18.04 (bionic) server installation (with systemd 237-3ubuntu10) which has following netplan configuration: ``` root@ubuntu:~# cat /etc/netplan/01-netcfg.yaml # This file describes the network interfaces available on your system # For more information, see netplan(5). network: version: 2 renderer: networkd ethernets: all: match: {} dhcp4: yes root@ubuntu:~# cat /run/systemd/network/10-netplan-all.network [Match] [Network] DHCP=ipv4 [DHCP] UseMTU=true RouteMetric=100 ``` Despite having DHCPv4 configured, no IPv4 address is configured on the ethernet device: ``` root@ubuntu:~# ip a show ens6 2: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 64000 qdisc fq_codel state UP group default qlen 1000 link/ether 02:01:71:8f:cc:72 brd ff:ff:ff:ff:ff:ff inet6 fe80::1:71ff:fe8f:cc72/64 scope link valid_lft forever preferred_lft forever ``` The kernel dmesg has no related messages and the journal log also looks normal: ``` root@ubuntu:~# journalctl -u systemd-networkd Jul 02 16:36:51 ubuntu systemd[1]: Starting Network Service... Jul 02 16:36:51 ubuntu systemd-networkd[1790]: ens6: Gained IPv6LL Jul 02 16:36:51 ubuntu systemd-networkd[1790]: Enumeration completed Jul 02 16:36:51 ubuntu systemd[1]: Started Network Service. Jul 02 16:36:51 ubuntu systemd-networkd[1790]: lo: Link is not managed by us Jul 02 16:36:51 ubuntu systemd-networkd[1790]: lo: Configured ``` Calling dhclient sets up the device correctly: ``` root@ubuntu:~# dhclient ens6 root@ubuntu:~# cat /var/lib/dhcp/dhclient.leases lease { interface "ens6"; fixed-address 87.106.172.36; option subnet-mask 255.255.255.255; option dhcp-lease-time 600; option routers 87.106.172.1; option dhcp-message-type 5; option domain-name-servers 46.16.74.70,46.16.72.37; option dhcp-server-identifier 87.106.172.1; option interface-mtu 64000; option host-name "ubuntu-18_04-fkb-2018-07-02"; renew 1 2018/07/02 16:46:51; rebind 1 2018/07/02 16:51:31; expire 1 2018/07/02 16:52:46; } root@ubuntu:~# ip a show ens6 2: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 64000 qdisc fq_codel state UP group default qlen 1000 link/ether 02:01:71:8f:cc:72 brd ff:ff:ff:ff:ff:ff inet 87.106.172.36/32 brd 87.106.172.36 scope global ens6 valid_lft forever preferred_lft forever inet6 fe80::1:71ff:fe8f:cc72/64 scope link valid_lft forever preferred_lft forever ``` To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/netplan.io/+bug/1779721/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
