Configuring a new router without disconnecting current one

I have a router at home with 2 different networks. One for my family, and one for guests. I am trying to replace my old router with a new one without disconnecting the old one. That way internet never goes down. Here's what I have tried to do in order to configure my new router: new router: EdgeRouter ER-8 Connect it to my computer which is running ethernet from a switch, and connect it to the switch ethernet as well. I go to command line and type: ipconfig, and see a standard 192.168.1.1 gateway. I type it onto the web and it shows my old router that is in use. I'm not sure what I'm suppose t

Question by martin on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.