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The value is in theory precise down to the millisecond, but I am skeptical. Does that number tell when the packet was transmitted, or when the connection began or ended?

Subsequently I noticed that there are flow-start time & flow-end time fields.


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RFC 5102 (which is based on Cisco NetFlow Version 9) talks about flowStartSysUpTime and flowEndSysUpTime. No other sysUptimes.

So, at least, this may be version and/or system dependent.

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