PLANET PRT-301W - Manual (Page 32)

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- Your ISP could be rejecting the Ethernet MAC addresses of all but one of your PCs.
Most broadband ISPs restrict access by only allowing traffic from the MAC address of
your Broadband Router, but some ISPs additionally restrict access to the MAC ad-
dress of a single PC connected to that modem. If this is the case, you must configure
to allow the Router to "borrow" the MAC address from the authorized PC.