"If you love the aroma of network packets, you'll love
capturing a snifter full of your favorite network-scented morsels
with Wireshark, the world's most popular network protocol analyzer.
"On a scale of one to ten, where one is dental surgery and ten
is winning a $100 million Powerball lottery, network protocol
analysis falls somewhere in the range of three or four. It isn't
exactly painful but it certainly doesn't arouse any fireworks or
thoughts of fireworks in your soul. Wireshark, however, makes
network packet sniffing and analysis easy and almost fun."