On Sun, Nov 21, 2021, 2:07 PM Guy Harris <ghar...@sonic.net> wrote: > The filtering is *not* done in the network adapter (which isn't > necessarily a card - it could be built into the computer); an adapter that > does the filtering itself could probably be built, and libpcap could be > modified to recognize cards that can do filtering and to tell the adapter's > driver, rather than the kernel's packet capture mechanism, what the filter > program is. I don't know of any adapters of that sort, however, and > libpcap currently has no code to do so. >
I'd still consider LoMs "cards" in a loose sense but that's me. FPGA-based network acquisition cards do implement filters in "hardware" (not in the system CPU). Napatech, Accolade, Silicom and Chelsio have products.
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