TP-Link Archer C60, AC1350Mbps "Connection attempt failed"

Installing and Using OpenWrt
1

Hello, I installed openwrt on TP-Link Archer C60, AC 1350 Mbps router and I could not connect to the internet without changing any settings. When I try to connect by setting pppoe in the wan settings, I get an error saying Connection attempt failed. I'm very new to this and I'm trying to get rid of the bufferbloat problem, please help.

I connected my connection via ethernet from the main modem to the wan port of the router, and then from the router to the LAN port of the computer.

My internet provider is TURKTELEKOM
75MBPS VDSL
VLAN ID 35

2

is your config similar to https://openwrt.org/docs/guide-user/network/wan/isp-configurations#turk_telekom ?

3

Actually, I use Turknet, but my internet provider told me that it uses Turktelekom infrastructure, and I also do not know how to change the config settings. Can you help me? I can only do things with Luci for now.