Filtering unwanted packets at ethernet interface level

[Russell Harmon]

On 7/25/07, Amit Walambe <awalambe at arcom.com> wrote:
> That brings me to the question : Is there any way in Linux kernel so
> that we can filter out unwanted packets at the physical layer, rather
> than to bring them up all the way to network stack?
AFAIK, hardware level packet filtering can only be done by very
expensive network cards or a motherboard with a nforce4 chipset (it
has a hardware level firewall which should handle this too). Most (all
that I know of except the nforce4) common network adapters do not
support hardware level packet filtering.