Ethereal is a GTK+-based network protocol analyzer, or sniffer, that lets you capture and interactively browse the contents of network frames. The goal of the project is to create a commercial-quality analyzer for Unix and to give Ethereal features that are missing from closed-source sniffers. Screenshot available here. Also added a toolbar and the ability to force the data link type of captured frames. Service response time and general I/O statistics have been enhanced. RTP analysis was improved.
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