I have a Tp-link archer a6 which works as a router extension to existing router. So if i enter 198.162.1.1 it enters my main router. However if i disconneted the internet cable from the router and just connect the router directly to my laptop i can enter openwrt settings from 198.161.1.1.
The issue is i cannot enter openwrt settings while router is connected to internet cable. If i disconnect the internet cable and connect directly to the router i can openwrt.
I just need internet connection to install luci-sqm.
If you change the openwrt router address to .4.1 it is another network. Refer to your ISP tech support to find an address for the openwrt that will not conflict.
Please, review your post and fix the IP addresses, because I suspect some of them are wrong. Also, clarify which device is which one, instead of calling both of them "router".