i have connected via lan-lan.
when i connect via wan-lan, i can't connect the router via ssh.
i don't really understand all this, i'm still a beginner. so i have 2 routers here in the room with internet connection. i just connected the two routers via wan-lan.
perhaps you should start by telling us what you want to achieve ?
strange... i just turned off the fritzbox and now i can no longer connect via ssh
i had only had my fritzbox in the closet. since i always use a hotspot via my smartphone and this consumes too much battery, i thought i could use usb tethering on the router with my smartphone. but the fritzbox firmware does not offer this function, so i wanted to install openwrt. but this is only available as snapshot version
Pretty sure tethering been available a lot longer than since 21.02, but OK.
But you're talking about two routers .... enlight us.
You have an obvious typo there.
The device has IP from the 192.168.1.x subnet, but you have said that the gateway would be on 192.168.2.1 subnet, while at the same time setting subnet netmask as 255.255.255.0 meaning that 192.168.2.x is unreachable and effectively you have no gateway. (And DNS says 192.168.1.1)
Sounds right if you want to follow the "dumb AP" advice.
Assuming that your main router is 192.168.1.1 and you use LAN-LAN cable ebtween the two routers, you need to set here
Dumb AP advice:
But like frollic says, there is some confusion, as you mention mobile tethering and two routers...
The router with openwrt is a Fritzbox 7360 with an outdated firmware, so it did not work.
Now to the two routers. I have once an EasyBox and an Asus router. The EasyBox router is connected to the internet. From the EasyBox I have connected a LAN cable at the lan port with the Asus router at the wan port.
Thanks first of all. Now I am not here at the moment. I will get back to you in two hours
If the "main router" Easybox is conneted to the internet, then it should be the one with 192.168.1.1 as the address.
And the OpenWrt router should be connected with LAN-LAN to it and have 192.168.1.11 (or something like that)
If the Easybox has something else, like 192.168.55.1, you should modify the advice and make the OpenWrt router to be 192.168.55.11 and then point its DNS and gateway settings to the main router at 192.168.55.1
i can't log into the router via ssh now 
using LAN cable on 192.168.1.11 ?
ok, i will reset openwrt first. i can't log in anymore. something i did wrong
my easybox router has the following ip and gateway:
IPv4 network 192.168.2.0/24
gateway 192.168.2.1
i have now set the following on openwrt
but it does not work yet
/etc/init.d/network restart
if the openwrt device isn't the ISP facing router, WAN shouldn't be PPPoE.
these are my current settings
I have also executed the command /etc/init.d/network restart.
but i still have no connection
and if i log in every time to the router with openwrt via ssh, then i have no wlan on the laptop, until i disconnect the lan cable between laptop and router again
That's pretty normal Windows behaviour.
is the openwrt router the 1st/primary router now ?
no, the easybox is still the main router
then you're back at no internet connection. set up network. help! - #17 by frollic or
no internet connection. set up network. help! - #8 by hnyman
But since your device is a DSL modem/router, with no regular WAN port, dumbap is pretty much the only way to use it, until you replace the Easybox with it.
