func (a *Allocator) getPredefinedPool(as string, ipV6 bool) (*net.IPNet, error) {
	var v ipVersion
	v = v4
	if ipV6 {
		v = v6
	}

	if as != localAddressSpace && as != globalAddressSpace {
		return nil, types.NotImplementedErrorf("no default pool availbale for non-default addresss spaces")
	}

	aSpace, err := a.getAddrSpace(as)
	if err != nil {
		return nil, err
	}

	for _, nw := range a.getPredefineds(as) {
		if v != getAddressVersion(nw.IP) {
			continue
		}
		aSpace.Lock()
		_, ok := aSpace.subnets[SubnetKey{AddressSpace: as, Subnet: nw.String()}]
		aSpace.Unlock()
		if ok {
			continue
		}

		if !aSpace.contains(as, nw) {
			return nw, nil
		}
	}

	return nil, types.NotFoundErrorf("could not find an available, non-overlapping IPv%d address pool among the defaults to assign to the network", v)
}

func (ep *endpoint) SetIPAddress(address *net.IPNet) error {
	if address.IP == nil {
		return types.BadRequestErrorf("tried to set nil IP address to endpoint interface")
	}
	if address.IP.To4() == nil {
		return types.NotImplementedErrorf("do not support ipv6 yet")
	}
	if ep.addr != nil {
		return types.ForbiddenErrorf("endpoint interface IP present (%s). Cannot be modified with %s.", ep.addr, address)
	}
	ep.addr = types.GetIPNetCopy(address)
	return nil
}

func (a *Allocator) getPredefinedPool(as string, ipV6 bool) (*net.IPNet, error) {
	var v ipVersion
	v = v4
	if ipV6 {
		v = v6
	}

	if as != localAddressSpace && as != globalAddressSpace {
		return nil, types.NotImplementedErrorf("no default pool availbale for non-default addresss spaces")
	}

	aSpace, err := a.getAddrSpace(as)
	if err != nil {
		return nil, err
	}

	for _, nw := range a.getPredefineds(as) {
		if v != getAddressVersion(nw.IP) {
			continue
		}
		aSpace.Lock()
		_, ok := aSpace.subnets[SubnetKey{AddressSpace: as, Subnet: nw.String()}]
		aSpace.Unlock()
		if ok {
			continue
		}

		if !aSpace.contains(as, nw) {
			if as == localAddressSpace {
				// Check if nw overlap with system routes, name servers
				if _, err := ipamutils.FindAvailableNetwork([]*net.IPNet{nw}); err == nil {
					return nw, nil
				}
				continue
			}
			return nw, nil
		}
	}

	return nil, types.NotFoundErrorf("could not find an available predefined network")
}

// DiscoverDelete is a notification for a discovery delete event, such as a node leaving a cluster
func (d *driver) DiscoverDelete(dType discoverapi.DiscoveryType, data interface{}) error {
	return types.NotImplementedErrorf("not implemented")
}

// Leave method is invoked when a Sandbox detaches from an endpoint.
func (d *driver) Leave(nid, eid string) error {
	return types.NotImplementedErrorf("not implemented")
}

// Join method is invoked when a Sandbox is attached to an endpoint.
func (d *driver) Join(nid, eid string, sboxKey string, jinfo driverapi.JoinInfo, options map[string]interface{}) error {
	return types.NotImplementedErrorf("not implemented")
}

func (d *driver) EndpointOperInfo(nid, eid string) (map[string]interface{}, error) {
	return nil, types.NotImplementedErrorf("not implemented")
}

func (d *driver) DeleteEndpoint(nid, eid string) error {
	return types.NotImplementedErrorf("not implemented")
}

func (n *network) ExecFunc(f func()) error {
	return types.NotImplementedErrorf("ExecFunc not supported by network")
}

func (d *driver) NetworkAllocate(id string, option map[string]string, ipV4Data, ipV6Data []driverapi.IPAMData) (map[string]string, error) {
	return nil, types.NotImplementedErrorf("not implemented")
}

// ElectInterfaceAddresses looks for an interface on the OS with the specified name
// and returns its IPv4 and IPv6 addresses in CIDR form. If the interface does not exist,
// it chooses from a predifined list the first IPv4 address which does not conflict
// with other interfaces on the system.
func ElectInterfaceAddresses(name string) (*net.IPNet, []*net.IPNet, error) {
	return nil, nil, types.NotImplementedErrorf("not supported on freebsd")
}

func (d *driver) ProgramExternalConnectivity(nid, eid string, options map[string]interface{}) error {
	return types.NotImplementedErrorf("not implemented")
}

func (c *controller) processExternalKey(conn net.Conn) error {
	return types.NotImplementedErrorf("processExternalKey isn't supported on non linux systems")
}

func processReturn(r io.Reader) error {
	return types.NotImplementedErrorf("processReturn isn't supported on non linux systems")
}

func sendKey(c net.Conn, data setKeyData) error {
	return types.NotImplementedErrorf("sendKey isn't supported on non linux systems")
}

// SetExternalKey provides a convenient way to set an External key to a sandbox
func SetExternalKey(controllerID string, containerID string, key string) error {
	return types.NotImplementedErrorf("SetExternalKey isn't supported on non linux systems")
}

func (c *controller) createGWNetwork() (Network, error) {
	return nil, types.NotImplementedErrorf("default gateway functionality is not implemented in windows")
}

func (d *driver) RevokeExternalConnectivity(nid, eid string) error {
	return types.NotImplementedErrorf("not implemented")
}

func (d *driver) CreateNetwork(id string, option map[string]interface{}, nInfo driverapi.NetworkInfo, ipV4Data, ipV6Data []driverapi.IPAMData) error {
	return types.NotImplementedErrorf("not implemented")
}

// FindAvailableNetwork returns a network from the passed list which does not
// overlap with existing interfaces in the system
func FindAvailableNetwork(list []*net.IPNet) (*net.IPNet, error) {
	return nil, types.NotImplementedErrorf("not supported on freebsd")
}