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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Using Multiple Filters
Suppose you want to identify all traffic between two machines. You could define primitives for those two hosts and then write a filter that specifically defines those hosts. However, this common situation will keep you very busy writing new filters. Instead, I find it much easier to define smaller filters and tie them together on the command line.
You can invoke flow-nfilter repeatedly in a single command. Find the flow files for the times you're interested in, filter them for the first host, and then filter them a second time for the second host.
#flow-cat ft-* |❶flow-nfilter -F host1 |❷flow-nfilter -F host2 | flow-print | less
The first flow-nfilter invocation at ❶ passes only flows that include traffic from host1. The ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.