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Tool to monitor the serial port of my Cisco router

I am looking for a tool to monitor the serial port of my Cisco router, specifically the line protocol.
You can try Ethereal - it's a free network protocol analyzer for Unix and Windows. It allows you to examine data from a live network or from a capture file on disk. You can interactively browse the capture data, viewing summary and detail information for each packet. Ethereal has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session. Here's a link:
This was last published in June 2003

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