EN0_RXCR
ether_outb(data, EN0_RXCR, ENRXCR_BCST | ENRXCR_MCST);
ether_outb(data, EN0_RXCR, ENRXCR_MON);
ether_outb(data, EN0_RXCR, ENRXCR_BCST);