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Passive
header measurements:
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tcpdump
archive
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NLANR PMA
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CAIDA
monitors
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tcpdump
wherever you want
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Sprint
POPs, AT&T dialup
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Passive
SNMP/netflow measurements:
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everyone
has tons of mrtg graphs
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local
flow data, flowscan, rrdtool data files
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Some
data proprietary/sensitive
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