def keepalived_ipv6_supported():

    br_name, ha_port, gw_port = base.get_related_rand_device_names(
        ['ka-test-', ha_router.HA_DEV_PREFIX, namespaces.INTERNAL_DEV_PREFIX])
    gw_vip = 'fdf8:f53b:82e4::10/64'
    expected_default_gw = 'fe80:f816::1'

    with ovs_lib.OVSBridge(br_name) as br:
        with KeepalivedIPv6Test(ha_port, gw_port, gw_vip,
                                expected_default_gw) as ka:
            br.add_port(ha_port, ('type', 'internal'))
            br.add_port(gw_port, ('type', 'internal'))

            ha_dev = ip_lib.IPDevice(ha_port)
            gw_dev = ip_lib.IPDevice(gw_port)

            ha_dev.link.set_netns(ka.nsname)
            gw_dev.link.set_netns(ka.nsname)

            ha_dev.link.set_up()
            gw_dev.link.set_up()

            ka.configure()

            ka.start_keepalived_process()

            ka.verify_ipv6_address_assignment(gw_dev)

            default_gw = gw_dev.route.get_gateway(ip_version=6)
            if default_gw:
                default_gw = default_gw['gateway']

    return expected_default_gw == default_gw
Check if keepalived supports IPv6 functionality.
dataset/ETHPy150Open openstack/neutron/neutron/cmd/sanity/checks.py/keepalived_ipv6_supported