5GHz wifi disappeared after power loss...

deemon · June 28, 2021, 1:00pm

Have RB4011iGS+5HacQ2HnD. (thanks MT for this super product name … LOL)
Had power outage here for like 10 minutes and after power came back on, only 2.4GHz wifi came back and wired connection.

5GHz wifi is not completely dead, as I can still scan with winbox and get to see table with neighbours 5GHz wifis…
But my own defined (and previously perfectly working) SSID does not show up in any of my devices. Disabling and re-enabling the QCA9984 doesn’t change anything.

How to even start to troubleshoot, what might have gone wrong?

edit: what is going on. the 5GHz wifi appears after like 20-25minutes afterwards (and started working… by itself.) So the qualcomm chip bootup time is 20+minutes?
disabled; re-enabled and same thing happened second time… it became available after re-enabling after 20+ minutes…

erlinden · June 28, 2021, 1:07pm

Could be that it is still radar scanning, which can take up to 10 minutes before starting to work.
Can you please provide your wireless settings?

/interface wireless export hide-sensitive file=anynameyoulike

deemon · June 28, 2021, 2:01pm

# jun/28/2021 16:58:36 by RouterOS 6.48.3
# software id = 98I9-VNJA
#
# model = RB4011iGS+5HacQ2HnD
# serial number = B8E00A4C7126
/interface wireless
set [ find default-name=wlan1 ] band=5ghz-a/n/ac channel-width=\
    20/40/80mhz-Ceee country=no_country_set disabled=no distance=indoors \
    frequency=5500 frequency-mode=superchannel installation=outdoor \
    mac-address=74:4D:28:8C:70:74 mode=ap-bridge radio-name=744D288C7074 \
    secondary-channel=auto ssid="Asgardian Empire5" station-roaming=enabled \
    wireless-protocol=802.11 wps-mode=disabled
set [ find default-name=wlan2 ] band=2ghz-g/n basic-rates-a/g="" \
    basic-rates-b="" country=no_country_set disabled=no distance=indoors \
    frequency=2462 installation=indoor mode=ap-bridge ssid="Asgardian Empire" \
    station-roaming=enabled supported-rates-a/g=\
    9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps supported-rates-b="" \
    tx-power=20 tx-power-mode=all-rates-fixed wireless-protocol=802.11 \
    wmm-support=enabled wps-mode=disabled
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk mode=dynamic-keys \
    supplicant-identity=MikroTik

deemon · June 28, 2021, 2:03pm

Ou... is that like a real thing? How can I see if this is the thing happening?

rextended · June 28, 2021, 2:12pm

It is the way is working, perfectly normal on 5GHz if you select dfs channel.

no_country_set has DFS on any channel

installation=outdoor
country=no_country_set

deemon · June 28, 2021, 2:15pm

that's the thing. I didn't. I chose 5500

rextended · June 28, 2021, 2:17pm

please do not quote if not necessary, use “post reply”, thanks

what is your country?

deemon · June 28, 2021, 2:28pm

no_country_set
because efff regulatory domains.

rextended · June 28, 2021, 2:29pm

You need to set debug instead…

Understand the hint??? :))))

deemon · June 28, 2021, 2:51pm

Sadly no. Can you give more details?

Anyway it seems my previously used channel-width=20/40/80mhz-XXXX wasn’t also ideal… when set it to 20/40/80mhz-Ceee it seems to come up much faster. Then again, it might suffer from bad neighbors invading my channel

rextended · June 28, 2021, 2:57pm

Really?..

/int wire set [find] country=debug

bpwl · June 28, 2021, 6:23pm

Please learn about DFS.

DFS is mandatory for any AP according country regulations. (does not apply to the client)
DFS will scan for radar for one full minute for frequencies from 5320 till 5700 for most countries. The fact that it is scanning IS IN THE LOG, when “wireless” has been added to system->logging
The weather channel frequencies 5600-5660 will need a full 10 minutes scan. (Even if just only a part of the 80MHz falls in the weather channels.)
During radar scan the interface will only scan. NOTHING is transmitted during that time.
If radar is detected then the scan process restarts on another frequency. If all channels have (even false) radar detect, the WLAN will never transmit.
If anything on the WLAN is touched, the scan process has to be done !
Most radar detects are “false positives”, at least it looks like that.

Example log: (see the timing)

.
“no country set” normally is illegal.
While no obeying DFS regulations, your device may show up in official weather maps. http://forum.mikrotik.com/t/for-all-you-mikrotik-geeks-out-there/149515/1

rextended · June 29, 2021, 7:38am

One thing are external ptp, another are AP inside home…