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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Filters and Variables
Flow-tools also includes filters that can be configured on the command line, which can be useful for very simple filters, such as identifying traffic from a particular IP address. The default filters that use these are fairly limited, but they'll suffice for simple traffic analysis. It's also easy to write your own variable-driven reports.
Using Variable-Driven Filters
The filters that are configurable on the command line use three variables: ADDR (address), PORT (port), and PROT (protocol). These support five reports, letting you filter by protocol as well as by source and destination address and port: ip-src-addr, ip-dst-addr, ip-src-port, ip-dest-port, and ip-prot.
Suppose your boss calls. She's connecting from a random open ...
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