Since i have not used tshark, tcpdump earlier so dont know how to use it,
man pages are lengthy and hence trying to read/use it .

The easiest thing is

$ tcpdump -i eth0 -w /tmp/test.pcap "tcp port 23"


$ tshark -i eth0 -w /tmp/test.pcap -f "tcp port 23"

Do this as root. Do use "tcp port 992" for Telnet-SSL. If you logged enought,
you can simply press Ctrl-C.

You can then post the "test.pcap" file to this list, or open it with the
graphical wireshark: "wireshark -r /tmp/test.pcap".

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