Wireshark is a network packet analyzer, which presents captured packet data in as much detail as possible.
Wireshark can capture traffic from many different network media types, including Ethernet, Wireless LAN, Bluetooth, USB, and more.
This program received 13 awards
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58.3 MB
Free
A very good network analyzer. Easy to use. Good for testers.
Hope to have Chinese interface supports.
Good tool for development. Every developer should have it.