[masraum]

If my assumption is true about the coax going into the wifi-router, then this might help.

The top is what you have now. Below that is what you would have.


The only real benefit that I can see is that a dedicated firewall might be a better firewall than a firewall built into a wifi-router, but maybe not. And then you're still adding all of that complexity and extra stuff to require maintenance or break.