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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.

WinPcap consists of a driver, that extends the operating system to provide low-level network access, and a library that is used to easily access the low-level network layers. This library also contains the Windows version of the well known libpcap Unix API.

Thanks to its set of features, WinPcap is the packet capture and filtering engine of many open source and commercial network tools, including protocol analyzers, network monitors, network intrusion detection systems, sniffers, traffic generators and network testers. Some of these tools, like Wireshark, Nmap, Snort, ntop are known and used throughout the networking community.

Winpcap.org is also the home of WinDump, the Windows version of the popular tcpdump tool. WinDump can be used to watch, diagnose and save to disk network traffic according to various complex rules.
Version 4.1.2, 02 jul 10

Bug fixing:
Fixed a bug reported by Boaz Brickner (http://pcapdotnet.codeplex.com/): the driver could cause an OS crash when an IRP_MJ_CLEANUP is processed in parallel with an IRP_MJ_READ/WRITE/DEVICECONTROL. The fix defers the deallocation of the open structure in IRP_MJ_CLOSE.

Fixed a bug in the buffered write code. A malformed transmit buffer sent with pcap_sendqueue_transmit could cause a buffer overflow and crash the OS.

Disabled tracing in the driver (it was left on by mistake in the previous release of WinPcap).

Added the missing export pcap_free_datalinks.
Do not show the installation panel with the OS info.
Small fix to the documentation regarding WDK.
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