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cool, I'll check the nic status before sending if I ever want to maximize throughput. But I'll probably rewrite it in C at that point too.

"Check the NIC status"? What network API are you using? Even if you're injecting with libpcap, you can still just select() on the device handle.

I am not using an API, I am writing to the driver

Just use Winpcap instead of wasting time reinventing this wheel.