Category Archives: Documentation

“Failed to install WinpkFilter NDIS LWF driver with error 0x800700b7” or critical value of driver customization

By | January 22, 2018

One of our customers has recently reported that WinpkFilter installation has failed with error code 0x800700b7. This was the first report mentioning such error code and we have spend some time to research the issue at a customer side. Such behavior seems to be worth mentioning in a dedicated post. 0x800700b7 error code can be decoded as ERROR_ALREADY_EXISTS,… Read More »

Windows Packet Filter and Gigabit networks

By | April 6, 2016

There is a very popular and important question about Windows Packet Filter: “Can I handle Gigabit traffic in WinpkFilter user-mode application without noticeable performance degradation?” I was asked quite often and usually my answer starts with “that depends…” followed up by various performance related considerations and ends with a sentence “if you need maximum possible performance then consider… Read More »

How to customize and build Windows Packet Filter drivers

By | March 1, 2016

Windows Packet Filter source code layout When you install Windows Packet Filter Source Code package you have got the folder named Kernel under the main installation folder with the following structure: /bin – contains driver’s binaries for all supported Windows versions /common – contains the source code shared along all supported Windows versions. If you plan to build… Read More »