nc := networkAndClusterForGateway(&gw)
		byNetworkAndCluster[nc] = append(byNetworkAndCluster[nc], gw)
	}

	var gwNum []int
	// Sort the gateways in byNetwork, and also calculate the max number
	// of gateways per network.
	for k, gws := range byNetwork {
		byNetwork[k] = SortGateways(gws)
		gwNum = append(gwNum, len(gws))
	}

	// Sort the gateways in byNetworkAndCluster.
	for k, gws := range byNetworkAndCluster {