Use Wireshark to capture and analyse packets

This one is probably aimed more at the geekier end of the market, but it is an application well worth covering.

There are many reasons why you might want to capture the raw network traffic that is entering and leaving your system. This can be for diagnostic purposes when something has gone wrong, finding out if there's a rogue program on your network, or if you're just curious ...

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KNetStats

KNetStats is a really simple network monitoring application for KDE.

You launch it, and it sits around in your system tray waiting for some network action. Much like the little network widget in Windows that sits in the system tray, the little computer icons light up to show incoming and outgoing traffic. In KNetStats' case, they flash green.

In addition to this, you can click the icon to bring up ...

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