Why can't I get into the Openwrt admin panel for the mr-3020 router via wifi?

Question

Network administration

I'll start then from the beginning in order:
There is no equipment. :) There was a cable from Rostelecom to the room, connected directly to the laptop. The provider distributes the Internet by binding to the MAC (without logins, passwords).
I bought the above router, registered this router with the provider. Haven't touched the firmware yet. The Internet has earned from a computer on wifi. The phones hung either on authentication or on receiving an IP, I did not see the wifi connection of the phones with the router. On the standard TP Link firmware, I could not get into the admin panel via wifi, provided that the provider's cable was plugged into the router. While there is no cable, it seems I can enter.
I need a router so far for the main purpose. Take traffic from the provider via an ethernet cable and distribute a pair of wifi APs with different rights.
I sew an OpenWRT 15.05 router with luci on board. I connect with an ethernet cable to the router, go through the browser to the web admin panel, I see only the lan interface. There is no Wan and I did not find the opportunity to add a wan interface. I set up wifi, disconnect the ethernet cable, connect via wifi. There is a connection, the computer received ip. I'm trying to log into the admin panel, zero. ping 192.168.1.1 is silent. I connect the cable again - the admin panel opens.
If I switch lan to a DHCP client, the router picks up ip from the provider, distributes the Internet, but it’s not possible to get into the admin panel without resetting the router settings (there is only one ethernet port in the router, so my computer can only connect to the router via wifi).
A similar problem was observed before flashing the router, on the standard Tplink firmware: I can’t enter the admin panel via wifi. just do not respond standard ip admin panels.
Another trouble (observed in the standard firmware, and in openWRT) as soon as the router starts to receive the Internet via an ethernet cable (Internet Rostelecom, Novosibirsk, MAC binding, no password logins), it does not allow more than 1 client via wifi. I connect with a computer, phones do not come in. Until I set lan to DHCP client mode, the phones were safely connected via wifi.

Answer 1

I'll start then from the beginning in order:
History adds sadness, because everything is much simpler and more banal.
There is no equipment. :) There was a cable from Rostelecom to the room, connected directly to the laptop. I bought the above router, registered this router with the provider. Haven't touched the firmware yet. The Internet has earned from a computer on wifi. The phones hung either on authentication or on receiving an IP, I did not see the wifi connection of the phones with the router. On the standard TP Link firmware, I could not get into the admin panel via wifi, provided that the provider's cable was plugged into the router. While there is no cable, it seems I can enter.
I sew an OpenWRT 15.05 router with luci on board. I go to the web admin panel, I only see the lan interface. There is no Wan and I did not find the opportunity to add a wan interface. Googled before switching wan ports. It’s like I don’t have anywhere to switch it (the ethernet port in the router is physically one, it says wan / lan.), But you never know what happened with the settings there. Adequately similar menus with signs of any vital activity were not found by wan.
I need a router so far for the main purpose. Take traffic over ethernet and distribute a pair of wifi APs with different rights. It's sad that elementary hands don't turn to adjust.

Answer 2

Initially, let's clarify what equipment you have besides the MR3020 router and for what purposes do you plan to use this router, which exact version of OpenWRT did you flash?
I can guess a little and assume that since you have a Rostelecom provider connected, then you have installed an Eltex, Huawei or EciBfocus optical modem, which does not have wifi, and using the MR3020 router you want to connect wireless devices to the modem.
Also, if my memory serves me, on mr3020, by default, lan and wifi interfaces are not combined into a bridge (bridge), since this router assumes that either lan or wifi will look at the Internet.
For clarity of examples, let's say that your optical modem from Rostelecom has an ip-address 192.168.0.1 and distributes addresses via dhcp in the range from 192.168.0.100 to 192.168.0.200.
So
1. Disconnect the router from the Rostelecom modem, if you have already managed to connect them with a cable, in order not to get confused.
2. Reset the settings of the mr3020 router to the initial state.
3. We go to the admin panel of the router at 192.168.1.1, set the password for the root user.
4. Go to the Network-Interfaces menu. Most likely you will have two LAN and WAN interfaces there. The LAN interface will be your cable connection, and the WAN interface will be wifi.
5. Delete WAN - press the Delete button. After that, you can click Save at the bottom (but not Save & Apply)
6. Now let's edit the LAN settings - click Edit.
7. Set Protocol: Static address, IPv4 address: 192.168.0.2 (as you noticed, this is a free address from the subnet of the Rostelecom modem), IPv4 netmask: 255.255.255.0, IPv4 gateway: 192.168.0.1, DNS: 192.168.0.1
8. A little below, check the box next to "Disable DHCP for this interface." This will turn off the function of distributing addresses on mr3020, because, as we agreed, the Rostelecom modem is engaged in distributing addresses. After that, you can click Save below (but not Save & Apply)
9. Go to the Physical settings tab.
10. Check the Bridge interfaces box.
11. Below, next to Interface, check the boxes for Ethernet Adapter: "eth0" and Wireless Network: Master "OpenWRT"
12. After that, you can click Save at the bottom (but not Save & Apply)
13. Go to Network-Wifi, opposite the wireless network, press the Enable button, and then Edit.
14. Set the channel and power to taste.
15. In the ESSID field, enter the name of our network, Mode: Access Point. Below we make sure that the checkbox is in front of lan.
16. In the Wireless security tab - Encryption: WPA2-PSK, Cipher: AES, Key: password from your network.
17. Now finally click Save & Apply.
18. We connect the router with a cable to the Rostelecom modem.
19. On any wireless device, we find our network, connect with the password indicated above.
20. We make sure that we correctly received the ip-address from the subnet of the Rostelecom modem 192.168.0.0/24.
21. Now we can try to open the admin panel of the mr3020 router at 192.168.0.2
22. The Internet should also work.
23. Check that the number of devices working on wifi can be more than one :)

Answer 3

set all devices (except the router) to automatically receive settings, most likely the IP address conflict occurs