>> Can anyone tell me how to set up a simple filter using BPF that blocks >> all the packets coming from a given MAC address? Out of curiosity what is this BPF you speak of? I googled for it and I came across "Berkeley Packet Filter" which sounds about on topic with this mailing list but it seems to be a FreeBSD util. I did an slocate for it on my box and it found nothing but a header file. Is this some non-standard util has a linux port for link layer filtering?