ADSL access route, computer internet sharing

Because my cat has its own routing function, I was going to buy a Wireless AP, but the Wireless AP on the market is more expensive, so I bought a wireless route tengda 541r, by the way, I bought a USB wireless network card that is up to 541u.
First, use the reset function to restore the initial settings of the cat, remove the route, and then connect the network cable connected to the ADSL cat to the WAN interface of the router. Connect the wireless network adapter to the route first, and then set the IP address 192.168.0.1.
This route setting is really easy and easy to set up. Of course, you need to know your account password. This password should be the one quickly changed by the stars. In terms of security, I only used MAC address filtering. I personally feel that this is safe enough.