I encountered this website and I found it very helpful and informative. (http://techgurulive.com/2008/09/22/how-to-do-mac-address-packet-filtering-using-iptables/). The following is a sample articel:
How to do MAC address packet filtering using IPTables
Media Access Control address (MAC address) or Ethernet Hardware Address (EHA) or hardware address or adapter address is a quasi-unique identifier attached to most network adapters (NICs). It is [...]
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