Originally Posted by luizm.jr
My cable modem a public IP provided by my ISP, and a private IP that is 192.168.0.1. My router has a WAN IP provided by my cable modem (192.168.0.xxx) and a LAN IP 192.168.1.1. My chromecast used to be connected in my router LAN, but I changed it to connect directly to the cable modem router. I'll try to put the cable modem in bridge mode to see what happens as I have full access to its configuration.
Yep that setup causes a double Nat situation Which doesn't work well for most networking applications....
Especially since you are also dealing with Two different Wireless networks.
Best setup is to have the modem just be a modem and send public IPs to whatever connects to it.
Then you won't have any Nat translation issues PLUS you get the ability (if your Modem has multiple ports like most Modem/Router Hybrids do, You can get a public IP for any device directly connected to the Modem which is good for running servers and for testing router issues.