hap ac^3 and sometime radar detection

RouterOS Wireless Networking
1

Hello.

I have hap ac^3 with long-term 6.48.6. Rarely, but it is, i have issues with 5 Ghz:

wlan5: radar detected on 5260000

And all devices on 5 Ghz is disconnecting. I have also 4 virtual SSIDs if it matters.

5260 is best frequency in my neighbour.

I want to disable this radar detection. In first, i change skip-dfs-channels from “all” to “disabled”. It is the right solutions? Radar will not detect anymore?

set [ find default-name=wlan2 ] band=5ghz-a/n/ac channel-width=20/40/80mhz-XXXX country=poland disabled=no distance=indoors \
    frequency=5260 installation=indoor mode=ap-bridge name=wlan5 security-profile=wlasny ssid=_5G wireless-protocol=\
    802.11 wps-mode=disabled
2

opposite. skip-dfs-channels=all

3

Normis, is that a safe practice? or does that mean dont use channels associated with RADAR or does it mean ignore any RADAR detections.
What if one lives 100miles from closest airport? The whole radar thing I find confusing.

4

It’s not only for airport radars.
Also weather radars.

5

It is safe. It will avoid radar channels so that no scanning is needed.

6

@normis is right, it’s safe…but would not use 5260 anymore since that’s a DFS channel.

7

So if one is XX miles from airport or weather radar, can we use it… What is the guidance. Makes no sense not to use good freq if available and live in the boonies…

8

See https://en.wikipedia.org/wiki/Dynamic_frequency_selection

“skip-dfs-channels” only affects the UI (which channels are selectable) and the possible frequencies “auto” uses. ISM probing will happen if the frequency is a DFS one. e.g. skip-dfs-channel is more a “firewall” against DFS channel being used in the first place. But if a DFS channel is used, and if RouterOS/chipset detect radar, it will switch channels and log that.

But there is always a chance of false-positives (e.g. there is no “radar”, but CAC/ISM triggers from something else) – so even in the boondocks could still be a problem. And in the boondocks case, there also maybe other open channels… I personally avoid DFS if at all possible, but that’s not always possible however.

e.g. skip-dfs-channels=all – but the OP should then pick a non-DFS channel as frequency= too was my point.

9

…and with a growing number of car manufacturers, that offer speed/distance control for (assisted) driving, based on radar..it’s a nuisance.

10

Changing the “skip-dfs-channels” parameter to “disabled” will allow your access point to use radar-detecting channels, but it will also make it possible for your access point to detect radar signals and disconnect devices connected to it.

If you want to disable radar detection completely, you can set the “dfs-mode” parameter to “none” for the relevant wireless interface. This will prevent the access point from using DFS (dynamic frequency selection) channels altogether, which means it won’t be able to detect radar signals on those channels either.

However, keep in mind that disabling radar detection altogether may be against local regulations and may cause interference with other wireless devices in your area. It’s recommended to check with your local regulatory body before making any changes to your wireless settings.

11

Bot answer …