I am not too much of a technician, therefor, I put in this link:
And correct me if I am wrong: two different APs wont be able to have the same ssid, right? As in one wifi ssid name through the whole house, independant from the used AP?
In the article you linked, search for "In this case, if the laptop connects wirelessly to router D, it will experience a 50% reduction in Internet speed."
As the article goes on to explain, this reduction in speed can be avoided with a repeater bridge; but only if you dedicate one of your two radios (2.4 GHz or 5 GHz) to that bridge and do not use the bridge radio for wireless client connections. The disadvantage here is that if you dedicate the 2.4 GHz radio for the bridge, wireless clients are limited by the slower 2.4 GHz WiFi bridge throughput (if you need the greater range of 2.4 GHz to do this, you may have no choice in the matter). If you dedicate the 5 GHz radio to the bridge, wireless clients instead connect to the 2.4GHz radio, and are still limited by the slower 2.4GHz WiFi network speed. However in this second case, you may find the 5 GHz WiFi is more than twice as fast as 2.4 GHz, in which case you would be better off using the 5 GHz radio for both the bridge and clients anyway (assuming range is sufficient). You would still lose up to half your 5 GHz throughput to the WDS link, but it would be worth it considering 5 GHz is usually more than twice as fast as 2.4 GHz.
Continuing with WDS is still a good plan. If it is working for you and gives you all the speed you need, by all means stick with what is working for you.
We are simply suggesting you may be able to do even better if you can wire your devices together with Ethernet back haul instead of wirelessly using WDS. Ethernet back haul would also be better even if you only have two devices. One device can be the router and provide WiFi, and the second device could be connected by wired Ethernet instead of WDS and be a dumb AP, leaving both the 2.4 GHz and 5GHz radios free for clients only.
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Thx for explaing. I am a bit confused now as both of my wireless APs are wired to my ethernet. Maybe, I understand something then fundamentally wrong 
I will read all your proposals carefully again.
It is like this now: AP1 and AP2 communicate with each other, but just for informational purpose, like: hey, look, its me, we are the same ssid. But traffic flows through each individual AP over the ethernet backbone.
If you have Ethernet between the two access points then you almost certainly donât want WDS.
The generally accepted view is that wired networks are much better than wireless, and your wireless needs to be more than twice as fast (typically 10x) to be worth using instead. The reasons for this are numerous, including latency, packet loss and consistency of throughput.
By using your Ethernet between the access points you will get a much more consistent and reliable link. Gigabit Ethernet will also be faster than the AX radios in any real world scenario.
Finally, by not using WiFi for WDS you leave more of it available for your client devices.
The APs ARE connected over the ethernet, just share the WDS link over Wifi.
So, under the line, the most effective way.
I'm not sure why you would want a WDS in addition to a wired backbone. Nothing beats that wired backbone. If anything, the WDS will eat bandwidth that could be used towards your real clients.
If you want your APs to communicate which clients they have connected and whatnot, and to smoothen handover, look at something like DAWN.
Till now, I had the opinion that having one single Wifi Network in my house was only possible if my two APs communicate with each other.
But as I just read somewhere on superuser website, I just have to give both APs the same SSID and all is good. That was beyond my knowledge till now. As I have no NAT, no Dhcp on this APs it should be straightforward.
Thx to all users and their valued infos!
Ps: changing the Wds to Ap only in my network had no effect, so, it was more like for administrative purpose, but in no case necessary.
And the same password and security settings too of course. You might also want to experiment with enabling 802.11r fast transition for each SSID to improve roaming. After you enable this check box in LuCI, many options appear, but the defaults should be fine for all of them to start with.
There is something you do not want to be the same, however. It is a good idea to have each AP use different non-overlapping channels on each radio to minimize wireless interference. For example, I use two AP's in my home. On 2.4 GHz, one uses channel 1 and the other uses channel 11, with both 2.4 GHz channels 20 MHz wide; and on 5 GHz one AP uses channel 36 and the other uses channel 149, with both 5 GHz channels 80 MHz wide.
Opinions differ, but you may also prefer to use a different SSID for 5 GHz and 2.4 GHz (but still the same on all AP's for each radio). This gives you better control over whether clients use 2.4 GHz or 5 GHz WiFi.
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I am reading this thread with lots of interest. I am having a similar situation, but some things are weird, I can try only.
Found the ZyXEL WSM20 (Multy M1) for 50⏠/ 2 pcs. The advantage of the WSM20 are more than 1 Ethernet port. I need 2. I bought 3 D-Link DAP-X1860 AX1800 Mesh Wi-Fi 6 Range Extender, easy to flash with Openwert, but only 1 Ethernet port, but can be plugged directly into the socket.
So does everything work with the WSM20, especially 802.11s(d)?
At the moment I am using WDS, but with different SSIDs. I was not happy with the same SSID. I often was connected to the weaker device. But this is a long time ago.
It looks like it is now more stable, since it is at 23.05.2
https://downloads.openwrt.org/releases/23.05.2/targets/ramips/mt7621/
Following https://openwrt.org/toh/zyxel/wsm20 you need to do 2 steps mainly:
Go to http://192.168.212.1/gui/#/main/debug/firmwareupgrade
Reboot
scp -O openwrt-23.05.2-ramips-mt7621-zyxel_wsm20-squashfs-sysupgrade.bin root@192.168.1.1:/tmp/:
sysupgrade -n
Dreaming of this. I assume there is something wrong here with the environment, 2m close to the upstream router is more worse than 10m. So I have to try, no idea if 802.11s can help, no idea if Wifi 6 helps.
Normally I setup WDS with an editor without luci. If you have one working, the others are more or less copy and paste. But I never tried it with roaming.
I thought I need 802.11s to use 802.11r, when the devices are wireless connected?
Hmmh, not sure if I did something right without knowing why. The connection from my upstream router is very bad. In theory 5GHz are possible, but it is a very weak signal, so I use 2.4GHz and now I have changed the connected routers / extender to 5 GHz, seems a little bit more faster, but still not excellent. Did a lot of iperf-testing.
That's what I did, but unfortunately the most important area in the house cannot be connected via ethernet.
I am going to read this post a few times, to be sure, that I understood what you said.
Looks like 802.11s could not be necessary. WDS is running, so can I do a quick test with 802.11s(d) by editing config files? I know I have to change the firmware with atheros-devices and use "non-ct". But it looks like I am changing all devices to AX. This double-pack from Zyxel could be a good deicision.
How do you see the ZyXEL WSM20 (Multy M1) compared to the Asus Asus RT-AX53U https://openwrt.org/toh/asus/rt-ax53u Please answer at MT7915 vs MT7905 vs MT7975: ZyXEL WSM20 vs. Asus RT-AX53U