code: func verifyNetworkingConfig(nwConfig *networktypes.NetworkingConfig) error {
  	if nwConfig == nil || len(nwConfig.EndpointsConfig) == 0 {
  		return nil
  	}
  	if len(nwConfig.EndpointsConfig) > 1 {
  		l := make([]string, 0, len(nwConfig.EndpointsConfig))
  		for k := range nwConfig.EndpointsConfig {
  			l = append(l, k)
  		}
  		return errors.Errorf("Container cannot be connected to network endpoints: %s", strings.Join(l, ", "))
  	}
  
  	for k, v := range nwConfig.EndpointsConfig {
  		if v == nil {
  			return errdefs.InvalidParameter(errors.Errorf("no EndpointSettings for %s", k))
  		}
  		if v.IPAMConfig != nil {
  			if v.IPAMConfig.IPv4Address != "" && net.ParseIP(v.IPAMConfig.IPv4Address).To4() == nil {
  				return errors.Errorf("invalid IPv4 address: %s", v.IPAMConfig.IPv4Address)
  			}
  			if v.IPAMConfig.IPv6Address != "" {
  				n := net.ParseIP(v.IPAMConfig.IPv6Address)
  				// if the address is an invalid network address (ParseIP == nil) or if it is
  				// an IPv4 address (To4() != nil), then it is an invalid IPv6 address
  				if n == nil || n.To4() != nil {
  					return errors.Errorf("invalid IPv6 address: %s", v.IPAMConfig.IPv6Address)
  				}
  			}
  		}
  	}
  	return nil
  }
docs: // Checks if the client set configurations for more than one network while creating a container
  // Also checks if the IPAMConfig is valid