func (config *configuration) processIPAM(ipamV4Data, ipamV6Data []driverapi.IPAMData) {
    for _, ipd := range ipamV4Data {
        config.Ipv4Subnets = append(config.Ipv4Subnets, &ipSubnet{
            SubnetIP: ipd.Pool.String(),
            GwIP:     ipd.Gateway.String(),