Last Friday I posted a list of free packet sniffers. There, I promised to write about my favorite tool. You might have guessed that it is Ethereal since it probably is the most popular free network packet sniffer. It has many feature which its free rivals lack. This is also true for the free sniffer SmartSniff which is a much simpler tool. However, SmartSniff has some features which are quite useful for system administrators that Ethereal lacks. Its founder, Gerald Combs, recently transferred to a new company and had to rename Ethereal to Wireshark. There might be two different packet sniffers in the future. At the moment the two tools have the same features though.
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