If youâ€™re anything like me, you often run into a computer problem or five that could be diagnosed more quickly by taking a peek at activity on the network. The best general purpose tool for inspecting network activity has gotta be Wireshark. Itâ€™s an industry-standard, open source packet sniffer that you can use for fun and profit. But on many Mac OS X builds, the default configuration for packet capturing is less secure than it ought to be. Here’s how to fix that on your Mac.