def CreateIpv4NgpfPy(ethernetObj, ipv4Name='',
                     ipv4StartValue=None, ipv4Step='0.0.0.1', ipv4Direction='increment',
                     ipv4PrefixStartValue=None, ipv4PrefixStep='0', ipv4PrefixDirection='incremnet',
                     gatewayIpStartValue=None, gatewayIpStep='0.0.0.1', gatewayIpDirection='increment'):

    # Example: 
    #     ipv4Obj = CreateIpv4NgpfPy(ethernet1, 'ipv4-1', ipv4StartValue='1.1.1.1', gatewayIpStartValue='1.1.1.2', ipv4PrefixStartValue='24')

    print '\nCreateIpv4StackNgpf: %s : %s' % (ethernetObj, ipv4Name)
    ipv4Obj = ixNet.add(ethernetObj, 'ipv4')
    if ipv4Name != '':
        ixNet.setAttribute(ipv4Obj, '-name', ipv4Name)
        ixNet.commit()

    if ipv4StartValue != None:
        # ::ixNet::OBJ-/multivalue:2
        ipv4Multivalue = ixNet.getAttribute(ipv4Obj, '-address')
        ixNet.setMultiAttribute(ipv4Multivalue,
                                '-clearOverlays', 'true',
                                '-pattern', 'counter'
                            )

        # ::ixNet::OBJ-/multivalue:2/counter
        ipv4MultivalueCounter = ixNet.add(ipv4Multivalue, 'counter')
        ixNet.setMultiAttribute(ipv4MultivalueCounter,
                                '-start', ipv4StartValue,
                                '-step', ipv4Step,
                                '-direction', ipv4Direction
                            )

    if ipv4PrefixStartValue != None:
        prefixMultivalue = ixNet.getAttribute(ipv4Obj, '-prefix')

        ixNet.setMultiAttribute(prefixMultivalue,
                                '-clearOverlays', 'true',
                                '-pattern', 'conter'
                            )

        prefixMultivalueCounter = ixNet.add(prefixMultivalue, 'counter')
        ixNet.setMultiAttribute(prefixMultivalueCounter,
                                '-start', ipv4PrefixStartValue,
                                '-step', ipv4PrefixStep,
                                '-direction', ipv4PrefixDirection
                            )

    if gatewayIpStartValue != None:
        gatewayMultivalue = ixNet.getAttribute(ipv4Obj, '-gatewayIp')
        ixNet.setMultiAttribute(gatewayMultivalue,
                                '-clearOverlays', 'true',
                                '-pattern', 'counter'
        )

        gatewayMultivalueCounter = ixNet.add(gatewayMultivalue, 'counter')
        ixNet.setMultiAttribute(gatewayMultivalueCounter,
                                '-start', gatewayIpStartValue,
                                '-step', gatewayIpStep,
                                '-direction', gatewayIpDirection
        )
    ixNet.commit()        
    return ipv4Obj