Sorry I can't go into the ins and outs of every command (as I don't know them all) that's where the ISP comes in!
If you ring your Internet Service Provider, the first thing they will say is reset the router (usually holding in the reset button for 10 secs)
Obviously, you will then need to set up your username and password again.
Maybe call them first (to stop the reply, "Now I can't get any Internet!!)