Network performance evaluation based on flow data

In this paper we present a flow-based method to evaluate network performance based on round-trip time (RTT). Using passively gathered flow-based data has advantages in both, performance and privacy, compared to active methods or passive packet-based approaches. The proposed algorithm is able to work on legacy Netflow v9 and IPFIX data, without being specifically collected for RTT measurements. To evaluate the method, results from packet-based passive RTT measurement implementations have been used for comparison.