I decided just to end up calling D-Link Tech support, and this is what they
told me;

1)  I need to have one end plugged into the modem.
2)  It will not effect the real ips.
3)  If the router goes down, everyone will be down :(

Then I asked him how often it goes down, and he said his goes down about 2
or 3 times a week.   That scares me.

-
Tyler Hall
http://www.nerdie.org