caf4926 wrote:All this is done by the DNServers
You can change it at the Router and at the OS level
But the Router is the ideal place
He doesn't have a router, just a modem that can't be modified. So he'll have to change it at the OS level. I agree that router is usually the best option, but I don't think that it is ideal for a single system household. The extra complexity is not worth the minimal benefits. Should the OP want to have a second system, then a router is ideal.
OP: see my advice a few steps above. I usually do that when travelling and using the hotel's internet connection. Some are so aggressive as to redirect you from Google to their site. In those cases, I usually use a proxy.