For network admins and network security professionals, one of the most important tools to learn to use is Wireshark (formerly Ethereal), a free and open source network analyzer/packet sniffer software ...

As one of the best network monitoring tools in the world, Wireshark is used by hackers and sysadmins alike to capture and analyze network packets across a myriad of situations for troubleshooting and ...

I think Loris has mentioned in the past that Wireshark is the perfect open source project, because you can have a whole bunch ...