You're reading from Digital Forensics and Incident Response - Second Edition

Product typeBook

Published inJan 2020

Reading LevelBeginner

Publisher

ISBN-139781838649005

Edition2nd Edition

Languages

Python

Tools

PowerShell Wireshark

Concepts

Forensics

Author (1)

Gerard Johansen

Analyzing NetFlow

NetFlow is a feature that was first introduced by Cisco Systems in the 1990s. NetFlow collects specific data about packets as they enter or exit an interface of a router or switch. This data is then sent to a NetFlow Collector via a NetFlow Exporter, which is often made part of switches or routers. The NetFlow Collector then aggregates and stores the flow data for analysis. This data is often leveraged by network and systems administrators to troubleshoot bandwidth issues, identify network congestion, and to observe the flow of data.

A sample NetFlow output is included next. What is included with flow data can vary from network device manufacturers as there are several versions in the commercial market. The following screenshot shows some of the basic information that is captured as part of a NetFlow dataset:

The following components of a NetFlow record are...

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Digital Forensics and Incident Response - Second Edition

Published in: Jan 2020Publisher: ISBN-13: 9781838649005

Author (1)

Gerard Johansen

Gerard Johansen is an information security professional with over a decade of experience in penetration testing, vulnerability management, threat assessment modeling, and incident response. Beginning his career as a cyber crime investigator, he has also worked as a consultant and security analyst for clients and organizations ranging from healthcare to finance. He is a graduate from Norwich University, gaining an MSc in Information Assurance and also a CISSP, and is currently employed with an international information technology services firm that specializes in incident response and threat intelligence.
Read more about Gerard Johansen

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