What is a protocol analyser ?
A protocol analyser is a program, that reads the frames of the network it is connected to, and resolves the content into source, destination and type of content. Such an analyser requires good knowledge of the structure of the used protocol. You’ll find free protocol analysers here:Analyzer based on WinPCap (Politecnico di Torino) The Ethereal Network Analyser When does a protocol analyser make sense A protocol analyser normally is used, if you want to know what is wrong with certain frames on your network. Permanent use makes no sense because of the amount of data to be stored. It is a suitable additional tool if an error is assumed on the protocol layer.