Good evening, I have recently decided to try OpenWRT thinking it would be relatively easy, especially since I have previous experience with Linux servers and whatnot, so it came in handy. The decision was because I noticed I sometimes face some odd packet loss in certain applications despite having very stable internet connection, furthermore, I had quite a lot of trouble with running servers and setting up port triggering for quite some time, so I wanted to try this out and see the difference.
I proceeded flashing the image in the router's page here, used version 19.07.5, however after flashing, I had no internet access. I had no idea why, it was my first time, I tried researching in various forums and trying to find someone that could actually help, but to no avail. I suppose it was related to an improper configuration because usually you need to set it up for your specific case - I have no idea what is my case.
I have 1Gbit internet that comes to my flat with an optical fiber cable, which runs to a fiber converter that has one Ethernet port. From the converter, the Ethernet cable runs to the Archer C6 v2 router WAN port. From here, I just have an Ethernet cable run to my PC from the first LAN port of the router. I have a dynamic IP address, meaning that usually after restarting the router, I receive a new IP address. As far as I understand, my router uses DHCP, at least it was configured to do so in official firmware, which is what the openWRT image is also configured to do - however, it didn't work, and soon for two days I will be sitting here without internet access.
I had no idea how to set this up in Interfaces, because that's where I thought the problem lies. Whenever I tried to edit some settings on the lan interface, it would often fail to apply and try to rollback, which would just stay there indefinitely, I would refresh the page and revert the changes (unless it refused to do so and I had to re-flash using TFTP).
After this, I realized I am not up to the task and I have no skills to make this work, nor knowledge. I got official firmware from TP-LINK website (1.3.5), flashed it using OpenWRT web GUI, but it kept on saying that it will upgrade and never restarted or actually flashed properly. I left it overnight because it was 7AM already (over-day really), and have been trying to fix it for the whole day today.
Let me tell you this - even if I flash the file using TFTP (turn off router -> hold RESET -> turn on router), the router does seem to grab the file from my PC, however, it just restarts and all I see is a glowing power LED. From there on, I tried to flash these official firmware versions: 1.0.1, 1.3.4, 1.3.5, 1.3.6 and two stripped bins that I found in the forums with no avail. FURTHERMORE, if I flash using TFTP when openWRT is flashed and accessible, it simply grabs the file, and then continues to reboot normally to openWRT and doesn't flash the firmware.
The only image that ACTUALLY FLASHES is ONLY openWRT. I have no idea why and don't understand why (and can't find any information about this, which infuriates me), but whenever I flash the official firmware with the web GUI or with TFTP, it never flashes I assume, and the only firmware that now flashes is only openWRT, which means I am basically stuck without internet access and with no way to revert back to original firmware.
I request help for fixing this, I am completely broken and tired with no more choices left.
Current configuration in the Interfaces of web GUI: