In this video I go over what happens when you use an Edgerouter in a network which already has an existing router. While I use the Edgerouter as the example and show some configuration, this is more of a theory and top-down view of how routing works in a home network with multiple routers. Sometimes, it is necessary to deal with more than one "router" in your network for various reasons. Hopefully, this video gives some insight into what is happening behind the scenes.
I go a bit crazy on my solutions to some of these "problems". Please watch to the end and don't try to follow along in real-time. While I mention a few ways to configure things, not all are recommended or even make much sense in the real world.