WinDump!

Packet library for Windows. WinPcap is the standard tool for link-layer network access in the Windows environments: it can be used to capture and transmit raw network packets and has many useful advanced features, including kernel-level filtering, a network statistics engine and support for remote capture. WinPcap consists of a driver, that extends the operating system to provide low-level network access and a library that developers can use to easily access the low-level network layers.WinPcap is the industry-standard tool for link-layer network access in Windows environments: it allows applications to capture and transmit network packets bypassing the protocol stack, and has additional useful features, including kernel-level packet filtering, a network statistics engine and support for remote packet capture. »