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.TP
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[\fB!\fP] \fB\-\-mac\-source\fP \fIaddress\fP
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Match source MAC address. It must be of the form XX:XX:XX:XX:XX:XX.
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Note that this only makes sense for packets coming from an Ethernet device
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and entering the
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.BR PREROUTING ,
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.B FORWARD
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or
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.B INPUT
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chains.
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