The EMIST NTD (Network Traffic Digesting) Tool is an off-line network traffic analysis tool capable of analyzing both TCPDUMP  and Cisco NetFlow  export format traces in Windows. The EMIST NTD tool can detect the significant clusters, i.e., clusters whose traffic is greater than a threshold (either in terms of packet number or bytes) that is user-specified. The thresholds can be specified for in a unidimensional fashion (for source IP, destination IP, source port, destination port or protocol) and also in multidimensional fashion for the five-tuple. The EMIST NTD tool is functionally similar to the AutoFocus tool in ; however, it is significantly more computationally efficient. The detailed algorithms for both unidimensional and multidimensional clustering processes are described in .
 TCPDUMP and LIBPCAP. http://www.tcpdump.org/.
 Cisco NetFlow Export Datagram Format. http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/nfc/nfc_3_0/nfc_ug/nfcform.htm#11770.
 "Automatically inferring patterns of resource consumption in network traffic", C. Estan, S. Savage, and G. Varghese, SIGCOMM2003.
 "Efficient Mining of the Multidimensional Traffic Cluster Hierarchy for Digesting, Visualization, and Modeling", J. Wang, D.J. Miller, and G. Kesidis, pending.
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NTD Software Version 1.0 User Manual
In this section, we provide sample trace files in both NetFlow V.5 and TCPDUMP format.
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