Check all packets from your system 

Involves using the netstat and snoop commands and interpreting the results

How to Check All Packets From Your System

Capture snoop results to a file

Involves using the -o option of the snoop command

How to Capture snoop Results to a File

Check packets between server and client 

Involves saving the results of the snoop command to a file and inspecting the results

How to Check Packets Between Server and Client