Home Security with my own modem and wifi router
I recently replaced the leased cable modem + router with a modem and router I purchased. When I attempted to connect the security system to the new router, I learned that I needed a "security router" for the security system. The security router is a Netgear WNR1000 which from what I can tell is nothing more than another wifi router. I would like to know the reason for needing another wifi router just for the security system. I want to know the technical reasons: is it so that Xfinity can set up a hotspot with this "security router" using my bandwidth and power? Does it have a backdoor that allows Xfinity to monitor my network? I see no technical reason why I can not connect the security system to my own router. Can someone with Comcast please provide a detailed answer for this requirement?
The problem I have with adding another piece of equipment is that I was told that it needs to connect to the modem directly. I only have one ethernet output from my modem that goes to my router. So, not only do I have to add the WNR1000 but a network switch so that I can connect it to my modem going from one cable+modem to four devices: a modem, router, switch and "security" router!
It seems like Comcast is purposely making it more cumbersome to have your own equipment so we'll be more likely to lease their equipment.