Conflicting wifi signal

I have two Zyxel NWA50AX Pro running on OpenWrt 24.10.5, one at the front my house and the other at the back. The dining room is somewhat right in the middle and I constantly experience very low bandwidth when a device is there (2-5% of the usual output). If I move either on the front or the back and I disconnect/reconnect (important) it’s back to normal.

First Device:

2.4Ghz: Type: MediaTek MT7981 802.11ax/b/g/n - Channel: 1 (2.412 GHz) - Bitrate: 39 Mbit/s

5 Ghz: Type: MediaTek MT7981 802.11ac/ax/n Channel: 36 (5.180 GHz) Bitrate: 755 Mbit/s

Second Device:

2.4 Ghz: Type: MediaTek MT7981 802.11ax/b/g/n - Channel: 1 (2.412 GHz) - Bitrate: 39 Mbit/s

5 Ghz: Type: MediaTek MT7981 802.11ac/ax/n - Channel: 36 (5.180 GHz) - Bitrate: 272 Mbit/s

My error was to keep the default settings I assume. Is there a way to chose the best channel for my neighbourhood (both these devices and other wifi devices around).

Thanks!

Start by looking at this video for bets access setup

Thanks. This is helpful.

I changed the band of device 2 from 1 to 11 (2.4Ghz) and 36 to 64 (5ghz). For the first band, all is fine and I can see with WifiMan they are separated correctly. However, the 5Ghz wouldn’t come up: it’s greyed out on Luci and nothing to be found on WifiMan. I’ve tried other higher band and the result is the same. I did wait a long time and restarted the device as well.

Any idea what I’ve done wrong?

Set country codes

It is set (BE).

Sorry for sounding bureaucratic. "second" dev bitrates are way too low.

Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button (red circle; this works best in the 'Markdown' composer view in the blue oval):

Screenshot 2025-10-20 at 8.14.14 PM

Remember to redact passwords, VPN keys, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/wireless
cat /etc/config/dhcp
cat /etc/config/firewall

Thanks for that. To avoid making that too long, I’ve gisted it:

Office AP: https://gist.github.com/snicoll/36790b9b3bfc92f74c3eef42011a2336

Kitchen AP: https://gist.github.com/snicoll/be37053d5bf0e0b94d8a2d0d6b6b7d13

The Kitchen is the one that has switched to a different band. There is also a router connected to fiber, also running openwrt (it’s a box and no wifi capabilities in the basement).

Set to auto channel in both bands, that will automatically select free channel and get good link rates.
If you really want to use same channel you need to adjust "cell density" parameter to minimize overlap space.

I clearly do not want the same channel, this was a mistake on my end from the getgo. I’ve set auto on both bands and both AP.

Office is good Channel: 13 (2.472 GHz) | Bitrate: 32.7 Mbit/s and 132 (5.660 GHz) | Bitrate: 361.2 Mbit/s

The one in the Kitchen still has no 5G showing up: Channel: 1 (2.412 GHz) | Bitrate: 39 Mbit/s and Channel: 116 (5.580 GHz) | Bitrate: ? Mbit/s

Don’t know how to debug that.

Try with different client device, should be maximum rate while AP is directly visible. eg. mobile phones and tablets aggresively powersave unless fully charged or charger connected.

"Not associated" / ? Mbps means nobody is connected and luci can not get beautiful numbers.

If speed is important, turn off 2.4 GHz entirely. If you can't cover the whole house with 5 GHz, add more APs. APs should be located inside the rooms with heaviest usage.

I know for sure it’s different. I am now connected with my laptop right in front of the AP and I can see my IP on Luci but my download speed is like 30Mbps and the 5Ghz band is still off.

Pure speed isn’t important but when the two APs where on the same band I had sometimes less than 1Mbps on the dining room. Changing the band definitely has fixed that but my problem is that 5Ghz is no longer enabled on one of the AP.

I need 2.4Ghz for legacy devices

1-2-6-12Mbps is powersave for sure. Powered laptop or desktop will maintain max link speed.

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When I am on the other side of the house I have 200 to 300Mbps on the same laptop and same condition.

Look below at "associated stations"

You need exactly one 2.4GHz most likely.

Give the 2.4 a different SSID so that your 5 GHz capable devices don't attempt to connect to it.

Wait this isn’t going anywhere, I think. On the screenshot, 5Ghz is off. It wasn’t like that before. How can I debug this and turn it on again?

Make sure you're not using a DFS channel. This has a "listen time" before it can bring up the radio to ensure that there is no radar on the same band (i.e. government military and weather services). If it doesn't sense any conflicts, it will bring up the radio after that delay, but it will immediately down the radio if it gets a 'hit' anytime during normal operation (and then you have another delay before it comes back up).

(see the 5GHz channels table)

The country code is set to BE. I did switch from auto to the original channel (36) yesterday evening. And the 5ghz band still doesn’t show up.

I also have WIFIMan desktop and I can see it’s gone as well. All I remember was changing the band so I don’t know what I could have done to break it. Wireless config available above.

Help please.