IT Forensics · Linux

Forensic analysis of network configuration under Linux – reconstructing interfaces and routing in a traceable manner

The network configuration of a Linux system comprises interfaces, IP address allocation, routing tables and, depending on the management tool used, various configuration formats, ranging from static files to NetworkManager profiles.

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For forensic reconstruction, it is important to know what network connections a system actually had at a specific point in time, as configurations may have been altered subsequently and historical states are not always obvious.

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Since its foundation, LanCologne has specialised in professional IT forensics. Our staff have decades of experience in the field of information technology and assist companies, solicitors, private individuals and, on a regular basis, the courts in the technical investigation of complex digital matters.

The examination is, as a matter of principle, carried out exclusively on a forensic copy, a forensic image or a data source captured in a technically equivalent manner that preserves the integrity of the evidence. The original evidence remains unchanged and is stored in a manner that preserves its integrity.

Our services

We systematically analyse existing network configuration files, reconstruct historical address and routing states using logs and metadata, and place network events in chronological order.

Typical areas of application

•Reconstruction of the network connection at a specific point in time
•Investigation of subsequent configuration changes
•Analysis of routing and address allocation histories
•Preparation for further network traffic analysis
•Incident Response on Linux Systems
•Judicial and non-judicial expert reports

This is how a network configuration analysis is carried out

Once the backup has been completed, all relevant configuration files and, where available, associated management tool profiles are recorded. The timestamps of these files, together with supplementary log entries, are used to date historical network states as accurately as possible.

Why is network configuration analysis relevant in a forensic context?

A system’s actual network connectivity at a given point in time is often a prerequisite for evaluating other network-related findings, for example in connection with access logs.

As configurations may change, checks are always carried out to ensure that the state observed at the time of the investigation is also representative of the relevant historical period.

Frequently Asked Questions

What network management tools are available on Linux?+
These include, amongst other things, traditional static configuration files, NetworkManager and distribution-specific tools, each of which uses a different configuration format.
Can historical network states be reconstructed?+
In some cases, provided that relevant logs, backups or metadata are available to document previous configuration changes.
Is the current configuration sufficient to support a forensic conclusion?+
Not always, particularly if the relevant incident period predates the last configuration change.

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