Dtyjlui

I'm having trouble understanding why an Ubuntu 18.04 LTS server installed on a bhyve host insists on requesting a dhcpv6 address despite being configured with a static address with dhcp6 off.

root@ubs:~# journalctl -u systemd-networkd

    ...

    -- Reboot --

Feb 15 14:01:45 ubs systemd[1]: Starting Network Service...

Feb 15 14:01:45 ubs systemd-networkd[584]: Enumeration completed

Feb 15 14:01:45 ubs systemd[1]: Started Network Service.

Feb 15 14:01:45 ubs systemd-networkd[584]: lo: Link is not managed by us

Feb 15 14:01:45 ubs systemd-networkd[584]: enp0s4: IPv6 successfully enabled

Feb 15 14:01:45 ubs systemd-networkd[584]: enp0s4: Gained carrier

Feb 15 14:01:46 ubs systemd-networkd[584]: enp0s4: Gained IPv6LL

Feb 15 14:01:48 ubs systemd-networkd[584]: enp0s4: DHCPv6 address 2a02:2f04:...::941a/128 timeout preferred 4500 valid 7200

Feb 15 14:01:50 ubs systemd-networkd[584]: enp0s4: Configured

    root@ubs:~# networkctl status enp0s4

    ● 2: enp0s4

           Link File: /lib/systemd/network/99-default.link

        Network File: /run/systemd/network/10-netplan-enp0s4.network

                Type: ether

               State: routable (configured)

                Path: pci-0000:00:04.0

              Driver: virtio_net

              Vendor: Red Hat, Inc.

               Model: Virtio network device

          HW Address: 00:a0:98:7a:8e:aa (NetApp)

             Address: 10.0.200.11

                      2a02:2f04:...::51

                      2a02:2f04:...::941a

                      2a02:2f04:146:...:8eaa

                      fe80::2a0:98ff:fe7a:8eaa

             Gateway: 10.0.200.1

                 DNS: 2a02:2f04:...::1

      Search Domains: domain.tld

    root@ubs:~#

But DHCP v6 is NOT configured:

root@ubs:~# cat /etc/netplan/50-cloud-init.yaml

# This file is generated from information provided by

# the datasource.  Changes to it will not persist across an instance.

# To disable cloud-init's network configuration capabilities, write a file

# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:

# network: {config: disabled}

network:

    ethernets:

        enp0s4:

            addresses:

            - 10.0.200.11/24

            - 2a02:2f04:...::51/64

            dhcp4: false

            dhcp6: false

            gateway4: 10.0.200.1

            gateway6: 2a02:2f04:...::1

            nameservers:

                addresses:

                - 2a02:2f04:...::1

                search:

                - domain.tld

    version: 2

root@ubs:~#

Who's sending the solicit message? is this a bug or i'm overlooking something obvious?

false is not an option according to the examples on the netplan website.
However, the netplan reference page states (bool), which makes true/false first guess.

dhcp4: yes/no

dhcp6: yes/no