Ethereal
Ethereal is a popular
computer network debugging and security auditing tool. The functionality it provides is very similar to
tcpdump (c.f.), but Ethereal adds a well-designed
GUI frontend, and many more information sorting and filtering options. It allows the user to see all traffic being passed over the network (usually an
ethernet network but support is being added for others) by putting the network card into
promiscuous mode.
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