I don't think a usb network adapter will help in this case. Your best bet is to get a usb router box and use that to connect to the net. Then plug ASL box into it and set it up to be on DMZ. Not the cheapest solution and chances are your ISP might send you an ethernet modem if you specifically request it. Any USB enabled router is probably going to be nice enough to take care of most things for you anyway (though not as good or flexible as ASL), but if youy have no choice you may look into something like thisL http://www.bestsystemsdirect.com/Products/2200USB/2200usb.html
