Got a nice Cisco 857w to play around with yesterday :) Before you get into any misconceptions let me tell you that I've never before made my own configuration in a Cisco router, but I really (really!) want to learn about it ( hey, stop snickering! ).
So... first things first - wipe out the router config, I thought, and start from scratch. I managed to do THAT part pretty easily, however, as any knowing person will tell you, that leaves all ethernet ports down... so here comes the console cable to the rescue! If you can actually make it to work :P