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Vadim Smirnov

all packets on the network layer (i.e., IP)

May be something like filter hook or firewall hook driver, I’m not sure if they deliver packet with or without Ethernet header . Basically I don’t see any problem with having Ethernet header for the packet like WinpkFilter does for implementing the solution you mentioned. IP packet follows Ethernet header, just make a 14 bytes offset.

or even transport layer (i.e., TCP)

You can create an LSP to operate on the winsock level or TDI level filter.