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I'd like to filter a specific packet sequence, if not by process, then by IP address/port combination.

Writing a DLL, modifying the process in question, or writing a program which hooks all functions isn't a viable solution; for whatever reason, hooking WSARecv fails.

I considered IPSEC, but I'm not sure if that allows you to block the content found in a packet. If it does, does anyone have a link to an article describing such a feature?

Thanks.