def startStopIpv4Ngpf(self, ipv4ObjList, action='start'):
        """
        Description
           Start or stop IPv4 header.

        Parameters
            ipv4ObjList: Provide a list of one or more IPv4 object handles to start or stop.
                 Ex: ["/api/v1/sessions/1/ixnetwork/topology/1/deviceGroup/1/ethernet/1/ipv4/1", ...]

            action: start or stop
        """
        if type(ipv4ObjList) != list:
            raise IxNetRestApiException('startStopIpv4Ngpf error: The parameter ipv4ObjList must be a list of objects.')

        url = self.ixnObj.sessionUrl+'/topology/deviceGroup/ethernet/ipv4/operations/'+action
        data = {'arg1': ipv4ObjList}
        self.ixnObj.logInfo('startStopIpv4Ngpf: {0}'.format(action))
        response = self.ixnObj.post(url, data=data)
        self.ixnObj.waitForComplete(response, url+'/'+response.json()['id'])