WinpkFilter is a high performance packet filtering
framework for Windows 9x/ME/NT/2000/XP that allows
developers to transparently filter (view and modify)
raw network packets with minimal impact on network
activity without having to write low level TDI or
NDIS
driver code.

WinpkFilter is more than just a firewall development
kit for Windows. Wide range of solutions can be
implemented using WinpkFilter: custom firewalls,
internet connection sharing (NAT), IP shaper, VPN and
many other low-level network solutions completely in
user-mode using your favorite development
environment:
Visual C++, Delphi, C++ Builder etc.

Using WinpkFilter requires no experience in kernel
mode programming on your behalf since WinpkFilter
provides you with powerful user level API. However,
if
you need to implement your solution (to achieve
better
performance) in kernel mode you can use well-
documented raw IOCTL interface as well.

Download (600 KB) Website Link to this page