i bought a d-link gateway/router a couple weeks ago from best buy. it is setup where i can use the internet for multiple computers, but the only way i could do this was to allow the router to supposedly "use" the mac address of the network card in one of my machines. i am on time warner cable service and can hook up any computer individually to use the internet. any ideas why the internet will only work with the router using the mac address of one of my ethernet cards? also, are there any security issues i need to worry about in doing this? i'm not too knowledgeable about computer security, but pretty interested.

also, i'm fairly new to the site, but so far i really enjoy it.