On Thu, Oct 30, 2003 at 04:12:45PM -0600, Nick J Marques wrote:
> We are using Ethreal to sniff for computers with viruses on our LAN by
> filtering for ARP Packets. How can I tell Ethereal to EXCLUDE Mac
> Addresses we have already logged??

"Exclude" as in "ignore packets from or to those MAC addresses?

If so, then, once you have those addresses, you'd use a capture filter
such as

        not ether host XX:XX:XX:XX:XX:XX and not ether host
            YY:YY:YY:YY:YY:YY ...

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