Comment 25 for bug 1662324

@corey Thanks.

it works fine as belows. disable_ipv6 is 0

6: ens4f1.1103@ens4f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master brqc1308c59-e3 state UP group default
    link/ether 52:54:01:97:26:35 brd ff:ff:ff:ff:ff:ff
7: brqc1308c59-e3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 52:54:01:97:26:35 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::7067:acff:fe3f:2c7c/64 scope link
       valid_lft forever preferred_lft forever
root@maas-node-18:~# cat /proc/sys/net/ipv6/conf/brqc1308c59-e3/disable_ipv6
0

ii neutron-common 2:8.4.0-0ubuntu7.5~cloud0 all Neutron is a virtual network service for Openstack - common
ii neutron-dhcp-agent 2:8.4.0-0ubuntu7.5~cloud0 all Neutron is a virtual network service for Openstack - DHCP agent
ii neutron-l3-agent 2:8.4.0-0ubuntu7.5~cloud0 all Neutron is a virtual network service for Openstack - l3 agent
ii neutron-linuxbridge-agent 2:8.4.0-0ubuntu7.5~cloud0 all Neutron is a virtual network service for Openstack - linuxbridge agent
ii neutron-metadata-agent 2:8.4.0-0ubuntu7.5~cloud0 all Neutron is a virtual network service for Openstack - metadata agent
ii neutron-plugin-ml2 2:8.4.0-0ubuntu7.5~cloud0 all Neutron is a virtual network service for Openstack - ML2 plugin
ii neutron-server 2:8.4.0-0ubuntu7.5~cloud0 all Neutron is a virtual network service for Openstack - server
ii python-neutron 2:8.4.0-0ubuntu7.5~cloud0 all Neutron is a virtual network service for Openstack - Python library