If your network is all on one subnet do you need a router? If you access the internet via an ISP internet connection is it correct to say that you will not need an edge router?
Yes and no. Ironic right. A router essentially allow you to "connect" between networks--your network and the ISP.
- if you only have a single device from your ISP's modem such as PC directly connected. So, in this case, you're right you do not need another "router." It is an endpoint that is directly attached to the modem.
- if you have additional devices that must use the same modem. now you will need a router. Even a "wireless router", a misnomer by the way, has a single router port that you see and internally there is a logical router port, along with a wireless hub and a unmanaged switch. We would use the router port to plug into the ISP's modem. Then internally all of our devices will send data to the default gateway (internal logical router port) to get access to the internet. In this case, it is required that you are using a router.
Hence, yes or no.
Hi Ronnie thanks for the reply. Unfortunately I still need a little more clarification.
In your second example will the user need to do any router configuration? The instructions that I have seen on routers talks about them being connected to multiple networks and they get configured so that they will correctly route the traffic.
At home I never did any router configuration on the cable modem yet I have multiple devices connected to it. Is the cable modem technically considered a router because it connects two different networks it just doesn't require the same kind of configuration that is discussed with routers since it is only intended to connect your local network to the ISP?