[cjw94022]

FYI, I also update the TCP and IP checksums before sending to the adapter.

[cjw94022]

I am having a similar issue. I have received using a filter, an incoming TCP SYN packet from an IP address I want to block. I can just drop it, but it will cause the remote sender to resend the packet multiple times before giving up. So I tried sending a RST packet response using the SYN packet as a base, swapping the ethernet address, IP addresses and TCP ports setting the TCP flags to RST and then sending the packet back to the adapter. However, the packet was never received at the destination, confirmed by running wireshark.

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