Ethereal is one of those packages that many network managers would love to be able to use, but they are often prevented from getting what they would like from Ethereal because of the lack of documentation. This document is part of an effort on the part of the Ethereal team to improve the accessibility of Ethereal.

http://www.astalavista.net

etherreal is indeed a nice tools. though sometimes it still puzzles me. maybe this will clear some things up.