June 2017
Intermediate to advanced
446 pages
10h 10m
English
Content preview from Mastering Python Networking
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Flow-based monitoring
As mentioned in the chapter introduction, besides polling technology, such as SNMP, we can also use a push strategy, which allows the device to push network information toward the management station. NetFlow and its closely associated cousins--IPFIX and sFlow--are examples of such information push from the direction of the network device toward the management station.
A flow, as defined by IETF (https://www.ietf.org/proceedings/39/slides/int/ip1394-background/tsld004.htm), is a sequence of packets moving from an application sending something to the application receiving it. If we refer back to the OSI model, a flow is what constitutes a single unit of communication between two applications. Each flow comprises a number ...
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