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SubjectRe: re. too long mac address for --mac-source netfilter option
jbinpg@home.com wrote:

>All hits on my firewall from cable modem servers other than my own provider also have the 14 group "MAC" address so it l>ooks like this may be a feature of these units.

Some cable providers use Ethernet bridging instead of full ip routing. perhaps this is what you are seeing.
Maybe TCPdump will label packets which are for "spanning tree" or similar?

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