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historical
archives often:
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are
truncated
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have
corrupt blocks, especially before clock resets
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file
formats don't usually have way of reporting loss (and if
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they
did, they might lie anyway)
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poor
time synchronization between directions
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broken
timestamp design:
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FORE
cards have hw and sw clocks, hw can wrap w/o sw noticing
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FORE
cards (and any normal NIC) have queues before timestamps
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University
sites on Abilene & vBNS links
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have
IP address encoding (changes per file)
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no
SNMP (mrtg) or other any sort of calibration/sanity
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