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I would like to create Snort rules based on MAC addresses instead of IP addresses. Most devices on the network are DHCP assigned, and I would like to ignore certain traffic (ex: Dropbox) for some devices without having to use static addresses or DHCP reservations. Can this be done?

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Snort works higher up on the stack. The protocols it deals with are TCP, UDP, ICMP, and IP.

Check out the manual.

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Understood - sorry for the noob question, but I'm just getting my feet wet again with Snort (via Security Onion) and haven't absorbed the whole manual yet :) What is the recommended method of handling this situation? Are DHCP reservations my best bet, or should I look in another direction? –  Jens Ehrich Nov 15 '12 at 2:38
    
MAC addresses make sense only on the same broadcast domain. Are you dealing with a small home network with a single router? If not, then DHCP reservations (or ignoring all Dropbox traffic, for example) are the best. –  Vitaly Osipov Nov 19 '12 at 23:19
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