June 2010
Intermediate to advanced
224 pages
5h 18m
English
Content preview from Network Flow AnalysisBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Collector Troubleshooting
If you configure a sensor to send data to your collector but flow-capture isn't generating any log files within a few minutes, start troubleshooting. Either the sensor is not transmitting data, flow-capture is not writing the data to disk, or a firewall between the sensor and collector is blocking that port.
To begin troubleshooting, first verify that sensor data is reaching your collector with tcpdump in order to separate network problems from local software problems.
# tcpdump -p -n -i em0 udp and port 5678The -p tells tcpdump to not put the interface into promiscuous mode. This means that the system will only sniff traffic that reaches the local interface. (A proper switch configuration should prevent promiscuous-mode ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.