Hi theveterans,
Thanks for the tipe. But if I factory reset it, it will have the same IP as my cable company's router so that IP address is taken. It will then simply suggest to use 192.168.2.1 which is in another range which I cannot connect to...
If your modem is a router/modem combo, make sure to set the DHCP on the LAN settings in the modem.
Then you can just bridge the router by using "AP Mode" and now you can assign ip to your ASUS router within the subnet 192.168.1.x but outside of modem's DHCP range.
For example, ISP router/modem has DHCP range from 192.168.1.2 - 192.168.1.100 with ISP's gateway as 192.168.1.1
Then, before you connect the ASUS to the ISP modem/router, manually change the LAN IP to 192.168.1.101 (outside of range but same subnet)
Then reconnect it again to the ISP. Now you should be able to access both modem and ASUS by typing their respective IP.
BTW, if you can't access the ASUS, just factory reset and don't connect to modem/router. From there you can use AP mode and set the LAN IP outside of DHCP but on the same subnet.
If modem isn't a router/modem combo, just make sure to obtain an IP from automatically on the WAN settings and change LAN IP can be 192.168.2.1 with DHCP (from router) set from 192.168.2.2 - 192.168.2.254
All of clients should be set to obtain IP from gateway automatically and you should get internet connection on either of those cases.