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Vadim Smirnov

Just thought to mentioned that I’m using the runtime libraries that are available at the web site (hxxp://

These binaries have no limitations.

Well, first of all I would start this application under debugger and check where it stops (or what is it doing) when network is frozen. Since this is a packet filtering application the network freeze can be easily caused by application hang (some dead lock or endless loop).

Also, I think it is important to mention that you should set MTU decrement if you are attaching additional data to the packets to the maximum size of the attached data. The total size of the ethernet frame should not exceeed 1514 bytes. I can’t see from your code if any length checks are implemented.