Introduction to Ethereal (v.0.9.9), The Open Source Network-Protocol Analyzer

6
Ethereal
...Features
Interactive GUI facility for building display filters
Distributions include text-based interface (tethereal)
similar to tcpdump, programmatic capture-editor and
converter (editcap), manpages for Unix and Linux (or
via web for Windows)
Analysis of live or saved network traces (packets can
be examined while capture is active)
Prints captures as plain text or postscript to file or
printer
Updated often (1 - 3 month intervals) with new
protocol decodings or enhancements to existing
decoders