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  Wireshark doesn’t just work in real time. If you save a history of network activity in a pcap file using a tool such as tcpdump, you can filter the data with Wireshark to search for evidence.

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• Network Analysis

  The nightmare of any admin is a user who can't resisting clicking on an unknown attachment labeled Application.exe. This article draws on a real-world example to show how you can use built-in Linux resources to detect unauthorized traffic that might have been invited in by a trigger-happy user.

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• Core Technologies

  Learn what's going on in your network, using Linux and its arsenal of packet capture tools.

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• Ethtool

  If ping won't solve your network configuration issues, try ethtool, a powerful utility that lets you manage configuration settings for your network interface card.

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• Backdoors

  Backdoors give attackers unrestricted access to a zombie system. If you plan to stop the bad guys from settling in, you’ll be interested in this analysis of the tools they might use for building a private entrance.

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