Leipzig-II Trace Data - Illustrated |
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This is a 1-day GPS-synchronised IP header trace captured simultaneously at either side of the University of Leipzig's central Internet access router. A pair of DAG3 cards were used to tap into the OC3 Packet-over-Sonet connection to the German research network (G-WiN). On the internal side, a DAG4.2GE card was used to tap into the 1000BaseSX link to the central campus switch. The timekeeping precision of the DAG timestamping engine, called the DUCK, has been monitored during the entire duration of the trace and is guaranteed to be less than 1 microsecond to UTC at all times. Trace records are of 64 bytes fixed length, containing full TCP/IP and UDP/IP headers in most cases. To process DAG traces, a toolkit called dagtools has been developed and is available from the DAG software Web site. The toolkit contains a range of tools from simple dump utilities to view the content of the trace, to converters (tcpdump/libpcap) and statistic generators. Data is available at the following locations: |
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