I'm confused as to what you are trying to say, but if I get what you are saying, if you are using DSL with a DHCP connection, you can go into the router and release the IP/DHCP settings and everything will be zeros till you renew it.
I'm talking about, a setup were u can only go on the internet through the router and if the internet plugged directly into the computer u won't get any internet
my brother always unhooks the router and hooks it to the computer which make all the other computers unable to access the internet. So this would prevent that