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