This happens to every single R201P we tested all deployed that matches below description and symptom
Symptom
- 5ghz will disappear after router turn on, cannot see on mobile of laptop wifi scanner. Also 5ghz LED light is off on router
- 2.4ghz is there
- Once you change something on the wireless 5ghz tab like frequency or radio on/off and it will tell you it's trying to save. The 5ghz will show up and be working and also 5ghz LED light will be on.
- But once you reboot the router, it will disappear and you will have to do the step above to get it working.
So below test is to find out what is going on
TEST (no mobile/laptop connected to router via wifi)
load our pre-configured config file
change PPPoE U&P/Wifi, the router rebooted itself
firmware is on 4.4.2-R2, 2.4ghz and 5ghz working ok.
Upgrade the firmware to 4.6-R8, 5ghz disappeared and LED light is off on the router. 2.4ghz is ok
Reboot router, both 2.4ghz and 5ghz disappeared
Change manually on 2.4ghz and 5ghz frequency channel, both show up working ok
Reboot router, both 2.4ghz and 5ghz disappeared
Downgrade the firmware to 4.4.2-R2, 2.4ghz and 5ghz working ok and LED light are on.
Now upgrade the firmware to 4.6-R16, 2.4ghz is working, but 5ghz disappeared and LED light on router is off on "5G"
so I took WAN cable off from the router and power cycle the router
I can see both 2.4ghz and 5ghz and it's ok to connect. But no Internet because WAN cable is unplugged.
Just to be sure
I power cycle the router again and I can see both 2.4ghz and 5ghz and both LED lights are on.
Now plug the WAN cable back in and power cycle the router
2.4ghz is there, but 5ghz disappeared and LED light is off on the router
making changes to 5ghz channel bandwidth to 20 from 20/40
Now I can see both 2.4ghz and 5ghz working ok and LED light are on.
Making changes will bring them back up so now I power cycle the router again
2.4ghz is working, but 5ghz disappeared and LED light on router is off on "5G"
ipphone[20975]: 0 Register Fail 403 Fail(403), retry=1200
ipphone[20975]: Reg terminated eReason=0
ipphone[20975]: 0 Register Terminate(0), 1200s later retry
Goahead_sh: +++++++++++++++++++++++++goahead.sh start,rebuild pidfile,STA...
Goahead_sh: goahead.sh set var language finished !!
Goahead_sh: goahead.sh set webport redirect finished !!
Goahead_sh: =============================start goahead in goahead.sh ,END...
looptask[21102]: start
goahead[21098]: webs start...
DEV_MANAGER[21049]: Attempting (re)connection in 5 seconds
goahead[21098]: webs: Listening for HTTP requests at address 192.168.11.1...
udhcpd[20035]: Sending OFFER of 192.168.11.42
udhcpd[20035]: Sending ACK to 192.168.11.42
provision[19006]: start to check config file
provision[19006]: Update configuration fialed, retry 3600 s later
provision[19006]: start to check command file
dropbear[21380]: Running in background
goahead[21098]: User:admin Web Login. IP:192.168.11.42
kernel: Wireless: Channel=11 False CCA=13874, beacon=10 Tx= 117 PER=100.0...
kernel: Wireless: sta info:curcount=0
kernel: Wireless: Channel=11 False CCA=3687, beacon=10 Tx= 132 PER=100.0%...
kernel: Wireless: sta info:curcount=0
kernel: Wireless: Channel=11 False CCA=4172, beacon=10 Tx= 192 PER=100.0%...
kernel: Wireless: sta info:curcount=0
kernel: Wireless: Channel=11 False CCA=2429, beacon=10 Tx= 168 PER=100.0%...
kernel: Wireless: sta info:curcount=0
kernel: Wireless: Channel=11 False CCA=1391, beacon=10 Tx= 144 PER=100.0%...
kernel: Wireless: sta info:curcount=0
kernel: Wireless: Channel=11 False CCA=3747, beacon=10 Tx= 111 PER=100.0%...
kernel: Wireless: sta info:curcount=0
To check that weirdness again I unplug the WAN cable and power cycle the router again
I can see both 2.4ghz and 5ghz working ok and LED light are on.
Try something different this time to have 1 mobile device connected to 5ghz
Turn off router, plug WAN cable back in
2.4ghz is working, but 5ghz disappeared and LED light on router is off on "5G"
so it doesn't make any difference
I apply this which was found on the forum (don't think it's the same fix but why not try it)
-2.4ghz on 20mhz channel only.
-Set "Operating Mode" to "Greenfields" on both 2.4ghz and 5ghz.
-Turn on A-MSDU on both 2.4ghz and 5ghz.
-Try turning off "TX Burst" in advanced on 2,4ghz and 5ghz
and now soft reboot router
2.4ghz is working, but 5ghz disappeared and LED light on router is off on "5G"
Try making additional changes to 5ghz Network mode to 11vht AC/AN from 11vht AC/AN/A
same result
2.4ghz is working, but 5ghz disappeared and LED light on router is off on "5G"
One thing I notice is that on the router status 5ghz's current channel status will show Channel 1, like it's dead
Change 5ghz Network mode to 11a/h mixed mode and power cycle the router
same result
2.4ghz is working, but 5ghz disappeared and LED light on router is off on "5G"
Another thing I notice is that after the power cycle and while waiting for the router to come back on (local ping to 192.168.11.1 still unreachable)
Both 2.4ghz and 5ghz are broadcasting and then when router is reachable locally that is when 5ghz went offline
Last step is change the firmware back to 4.4.2 which I know it works.
With so many little changes on the wifi tab, firmware 4.4.2-R2 still works ok