lpc1857 ethernet filter settings

Hello,
I'm developing an application using the LPC1857 Starter Kit.
I need to filter the broadcast incoming packet.

I tried to set the MAC_FRAME_FILTER as in the follow:

LPC_ETHERNET->MAC_FRAME_FILTER = MFFR_DBF;           /* Disable Broadcase Frames */

but in this way I can't receive any packet.

Could someone explain me how to set the Ethernet address to block broadcast packet?

Thanks in advance.

Giovanni

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