Binding named to a specfic device

[David]

Hey guys could someone plz help me!!?!? I have a cable modem at home
attached to my linux box running a bunch of stuff and working as as
router/firewall. Well i decided to run bind on my machine to act as a
caching name server and forwarder. But the problem is very small. Everything
works fine. But i just wanna know how to bind it to the internal ethernet
card. I don't want it bound to the external network card which is on the
internet. I don't want hackers to hack in this way. Anyone that could tell
me how to just bind it to eth0 (my eternal network card) that would be
great. Thanks
Dave