Using a packet analyzer software (aka. packet sniffer, network analyzer, protocol sniffer, protocol analyzer) to capture network traffic to analyze and troubleshoot network problem is an important job for network management. The charm of packet analyzer software is that you can use them to listen on a cable and know what the machines are transmitting and communicating with other hosts. This blog post covers the basics that where you should capture with a packet analyzer software on your network so you get traffic to your interest.