MAC address & rc.conf

[luke]

a better solution to this is to call your isp and tell them your
network card died so you got a new one with MAC address of the freebsd
machine. they can reset the MAC they have on their end and you'll be
alright. also, sometimes the modem is storing the MAC so you can
either reset it if it has a switch or power it down for about 10
minutes to erase its memory. if you do this you'll have to reenter
your pppoe info though so make sure you have it. good luck.