[Bug 1779721] Re: systemd-networkd does not configure DHCPv4

[maria smith]

In both cases, no network, no static IP address, .. however, restarting systemd-networkd instantly brings the configuration up, and communication on the desired IP address starts.
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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 at 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 at 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 at 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 at 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 at ubuntu:~# dhclient ens6
  root at 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 at 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
  ```

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