Linksys 1900AC V1 Wifi issues

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blkt
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Joined: 20 Jan 2019
Posts: 3897

PostPosted: Sat Feb 22, 2020 23:28    Post subject: Reply with quote
Some good news for whenever the next public build releases.

https://svn.dd-wrt.com/ticket/6965#comment:130

https://svn.dd-wrt.com/changeset/42490
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kernel-panic69
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Posts: 12472
Location: Texas, USA

PostPosted: Sat Feb 22, 2020 23:40    Post subject: Reply with quote
It's too bad that you can't set up a development environment with the public svn repo since you need what is in the driver_repository repo to make a successful image.
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Neil1454
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Joined: 29 Jan 2012
Posts: 63

PostPosted: Sun Feb 23, 2020 12:16    Post subject: Reply with quote
So from my log post theres nothing really that stands out that is an issue as to why 2.4ghz drops? It is going to be a client elimination process?

I never knew clients could bring down a wifi radio. Thought it would just connect to the router and work or not.
blkt
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Joined: 20 Jan 2019
Posts: 3897

PostPosted: Sun Feb 23, 2020 13:08    Post subject: Reply with quote
I see a couple of things here at play. The jump from r37012 to r42366/r42410 put you right in the middle of a restructuring process for channel selection. The next build after r42460 should fix 5 Ghz reliably starting at boot. The last build before major changes was r42335.

Since you had similar 2.4 Ghz issues on r37012 this leads me to believe there's a problem between at least one of your client devices and the Marvell radio chipset.

If you don't want to hunt down devices, try WENED's workaround by setting 2.4 Ghz Wireless Network Mode to G-Only and/or disabling WMM. Save and then reboot.

Check syslog for spam auth request and deauthenticated due to inactivity. Hopefully all of that should disappear.
WENED
DD-WRT Guru


Joined: 30 May 2017
Posts: 564
Location: Rural Manitoba

PostPosted: Sun Feb 23, 2020 16:19    Post subject: Reply with quote
Have done a lot of research and testing over the past few days.
WMM protocol is a QOS and Client Powersave protocol.
To function correctly both ends must be in sync.
Android 7, 8, 8.1 all have noted some problems with this. Can be corrected/minimized by configuration in the client device.( Don't ask, I don't have details). My two Zenphones are identical but one which I configured extensively to reduce battery use rarely has problems with my routers, the other is constantly re-connecting. This on mwlwifi which is a mess anyway. Setting to G only and disabling wmm does solve the constant disconnects.
For devices which do not support the wmm protocol (most cheap smart devices) switching to G only and disabling wmm is the only way to get decent connections.
Of course this only seems apparent with mwlwifi but I began thinking that if mwlwifi has so much trouble dealing with the protocol, it only comes to reason that other router chip sets would also be heavily taxed trying to handle this protocol. I have since disabled wmm and set my 1900 to G only to see how this might affect performance.
In the case of my 1900 I would get periodic reboots for no known reason. I have long suspected that it is due to the smart devices connected, as I know they are not wmm compatible and require constant internet connection. I have yet to see if this action stops the reboots. It is my belief at this time that if devices are not wmm compatible or incorrectly setup to accomodate it they over tax the router stack and eventually cause lockups or reboots. This is only conjecture at this point.
Blkt, you are correct in that device isolation is required to determine which devices are causing the lockups. In my case simply going to G only and disabling wmm is a simple solution as The increase in speed is negligible for any of my devices. Besides once wmm is active there is some speed loss anyway so being able to jump apparently 20% with wmm it is likely negated anyway. If I had devices that were capable of 300/600 on 2.4 I would obviously setup a separate VAP accordingly.
In conclusion, although wmm doesn't appear to cause any serious problem on non-mwlwifi I do believe it has an impact and should be considered as a source of strange problems. It may take a few days to determine if this is the cause of my reboots, but so far 36 hours and no reboot.

_________________
WRT3200acm Master WDS 5GHz 80Mhz CH 100 (+6) r48567
Ath1 2.4Ghz Disabled
99 Static Leases
ExpressVPN

WRT3200acm r48567 WDS Station 5Ghz
Ath1 AP N/G Mixed Channel 11 HT40

WRT1900Ac V1 5Ghz r48567 WDS Station
(Defective, no 2.4Ghz but 5Ghz works great)

WRT1900AC V1 5Ghz AC 80Mhz WDS Station r48567
2.4Ghz AP Ch1 HT20 Mixed

WRT1900ACS SPARE r47608

WRT1900AC V1 5Ghz AC 80Mhz WDS-AP r48567
2.4Ghz AP Ch1 HT20 Mixed

WRT54G DD-WRT v3.0-r37305 micro AP CH 6 Mixed - Not in use

3200 Master -> LAN -> 1900ACS -> WDS 5Ghz -> 1900 V1 (X2)
3200 Master -> WDS -> 3200 Slave & 1900V1
blkt
DD-WRT Guru


Joined: 20 Jan 2019
Posts: 3897

PostPosted: Sun Feb 23, 2020 16:59    Post subject: Reply with quote
"if you disable you effectivily disable 802.11n in a indirect way. without wmm 802.11n is not operational. its well known that the issue an be resolved if you run the interface in 802.11g only" - BrainSlayer

"I created a secondary SSID on the 2.4GHz radio, dedicated exclusively for the IoT devices, and with WMM disabled; so far, everything seems to be working properly." - eduperez

"WMM is per interface, but Operating frequency (we need Legacy in there to get ESP8266 working) is per network." - lenisko

"Odd, it worked with MWW on, but only in Legacy mode" - ialex87
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 12472
Location: Texas, USA

PostPosted: Sun Feb 23, 2020 18:38    Post subject: Reply with quote
blkt wrote:
"if you disable you effectivily disable 802.11n in a indirect way. without wmm 802.11n is not operational. its well known that the issue an be resolved if you run the interface in 802.11g only" - BrainSlayer

"I created a secondary SSID on the 2.4GHz radio, dedicated exclusively for the IoT devices, and with WMM disabled; so far, everything seems to be working properly." - eduperez

"WMM is per interface, but Operating frequency (we need Legacy in there to get ESP8266 working) is per network." - lenisko

"Odd, it worked with MWW on, but only in Legacy mode" - ialex87



_________________
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DON'T use Chromium-based browsersRTFM/STFW TL;DR is NOT an excuse. • Why Should I Care What Color the Bikeshed Is‽
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WENED
DD-WRT Guru


Joined: 30 May 2017
Posts: 564
Location: Rural Manitoba

PostPosted: Mon Feb 24, 2020 1:09    Post subject: Reply with quote
Additional testing netted the following results;
On my 3200 remote I restored wmm and N only operation.
Had to remove one old camera as it couldn't seem to decide if it was going to run on G or N , kept switching so I moved it to my other 3200 which I use for Sonoff devices.
Also by playing with the settings on my erratic Zenfone specifically turning off Wi-Fi search, I pretty much eliminated all strange entries in the syslog.
On the 1900 I tried using a VAP to isolate my cams from the Sonoff devices but still kept getting a lot of syslog entries. If I restored N/G and wmm I here too had devices that couldn't seem to decide on which band to run, so I went back to the G only.
Also to reduce the re-syncing I set the "Key Renewal Interval" to 86400 so it only occurs once a day rather than the default of every hour.

_________________
WRT3200acm Master WDS 5GHz 80Mhz CH 100 (+6) r48567
Ath1 2.4Ghz Disabled
99 Static Leases
ExpressVPN

WRT3200acm r48567 WDS Station 5Ghz
Ath1 AP N/G Mixed Channel 11 HT40

WRT1900Ac V1 5Ghz r48567 WDS Station
(Defective, no 2.4Ghz but 5Ghz works great)

WRT1900AC V1 5Ghz AC 80Mhz WDS Station r48567
2.4Ghz AP Ch1 HT20 Mixed

WRT1900ACS SPARE r47608

WRT1900AC V1 5Ghz AC 80Mhz WDS-AP r48567
2.4Ghz AP Ch1 HT20 Mixed

WRT54G DD-WRT v3.0-r37305 micro AP CH 6 Mixed - Not in use

3200 Master -> LAN -> 1900ACS -> WDS 5Ghz -> 1900 V1 (X2)
3200 Master -> WDS -> 3200 Slave & 1900V1
Neil1454
DD-WRT User


Joined: 29 Jan 2012
Posts: 63

PostPosted: Mon Feb 24, 2020 23:17    Post subject: Reply with quote
WENED wrote:
Additional testing netted the following results;
On my 3200 remote I restored wmm and N only operation.
Had to remove one old camera as it couldn't seem to decide if it was going to run on G or N , kept switching so I moved it to my other 3200 which I use for Sonoff devices.
Also by playing with the settings on my erratic Zenfone specifically turning off Wi-Fi search, I pretty much eliminated all strange entries in the syslog.
On the 1900 I tried using a VAP to isolate my cams from the Sonoff devices but still kept getting a lot of syslog entries. If I restored N/G and wmm I here too had devices that couldn't seem to decide on which band to run, so I went back to the G only.
Also to reduce the re-syncing I set the "Key Renewal Interval" to 86400 so it only occurs once a day rather than the default of every hour.


Disabling just wmm has given me the best 2.4ghz stability.
No issues so far in over 48 hours and that's not been known that I can remember.

Will report more the more tests i do.
blkt
DD-WRT Guru


Joined: 20 Jan 2019
Posts: 3897

PostPosted: Mon Feb 24, 2020 23:29    Post subject: Reply with quote
The alternative is G-Only or BG-Mixed, whatever works for you really.
WENED
DD-WRT Guru


Joined: 30 May 2017
Posts: 564
Location: Rural Manitoba

PostPosted: Mon Feb 24, 2020 23:35    Post subject: Reply with quote
Neil1454 wrote:
WENED wrote:
Additional testing netted the following results;
On my 3200 remote I restored wmm and N only operation.
Had to remove one old camera as it couldn't seem to decide if it was going to run on G or N , kept switching so I moved it to my other 3200 which I use for Sonoff devices.
Also by playing with the settings on my erratic Zenfone specifically turning off Wi-Fi search, I pretty much eliminated all strange entries in the syslog.
On the 1900 I tried using a VAP to isolate my cams from the Sonoff devices but still kept getting a lot of syslog entries. If I restored N/G and wmm I here too had devices that couldn't seem to decide on which band to run, so I went back to the G only.
Also to reduce the re-syncing I set the "Key Renewal Interval" to 86400 so it only occurs once a day rather than the default of every hour.


Disabling just wmm has given me the best 2.4ghz stability.
No issues so far in over 48 hours and that's not been known that I can remember.

Will report more the more tests i do.


I am glad to see you are making progress and operating much better. Don't delve too deep as mentioned in this and other posts BS is redeveloping the Wi-Fi. Do post if you discover anything new and like myself watch for new builds as they will likely be quite different for the wireless operation.

_________________
WRT3200acm Master WDS 5GHz 80Mhz CH 100 (+6) r48567
Ath1 2.4Ghz Disabled
99 Static Leases
ExpressVPN

WRT3200acm r48567 WDS Station 5Ghz
Ath1 AP N/G Mixed Channel 11 HT40

WRT1900Ac V1 5Ghz r48567 WDS Station
(Defective, no 2.4Ghz but 5Ghz works great)

WRT1900AC V1 5Ghz AC 80Mhz WDS Station r48567
2.4Ghz AP Ch1 HT20 Mixed

WRT1900ACS SPARE r47608

WRT1900AC V1 5Ghz AC 80Mhz WDS-AP r48567
2.4Ghz AP Ch1 HT20 Mixed

WRT54G DD-WRT v3.0-r37305 micro AP CH 6 Mixed - Not in use

3200 Master -> LAN -> 1900ACS -> WDS 5Ghz -> 1900 V1 (X2)
3200 Master -> WDS -> 3200 Slave & 1900V1
Neil1454
DD-WRT User


Joined: 29 Jan 2012
Posts: 63

PostPosted: Mon Feb 24, 2020 23:43    Post subject: Reply with quote
To use isolation to capture suspected devices causing the issues. What is the best way to do this ?
Via virtual wifi ?
Would enabling wmm on virtual wifi work or will that cause the lock up on the non virtual 2.4ghz radio as well ?
WENED
DD-WRT Guru


Joined: 30 May 2017
Posts: 564
Location: Rural Manitoba

PostPosted: Tue Feb 25, 2020 0:10    Post subject: Reply with quote
Neil1454 wrote:
To use isolation to capture suspected devices causing the issues. What is the best way to do this ?
Via virtual wifi ?
Would enabling wmm on virtual wifi work or will that cause the lock up on the non virtual 2.4ghz radio as well ?


The easiest way is as suggested. Disconnect devices (power off) one by one and monitor the results.

Setting up a VAP is also an option but I am not sure it is a viable solution. You must keep in mind that VAP gets a lot of it's settings from the AP and it is using the same radio so you may create a whole new set of problems. You can disable wmm on the VAP or AP separately but as I said not sure how effective this would be. Also by running a VAP remember that because it is still the same radio it will only communicate half the time on either.
I have the luxury of multiple routers where I can usually switch devices to a different configuration on another router. I also have a spare 1900 for use when diagnosing my remote 1900 in the barn.
Since you are currently running with wmm off on your AP you could create a VAP with wmm enabled, but be cautious of the results. Also to do proper testing and because the VAP inherits settings from the AP, you will need to set your AP mode to "Mixed" or at least "N/G mixed" as ther is not an option for this in a VAP.
Good luck and enjoy the indulgence.

_________________
WRT3200acm Master WDS 5GHz 80Mhz CH 100 (+6) r48567
Ath1 2.4Ghz Disabled
99 Static Leases
ExpressVPN

WRT3200acm r48567 WDS Station 5Ghz
Ath1 AP N/G Mixed Channel 11 HT40

WRT1900Ac V1 5Ghz r48567 WDS Station
(Defective, no 2.4Ghz but 5Ghz works great)

WRT1900AC V1 5Ghz AC 80Mhz WDS Station r48567
2.4Ghz AP Ch1 HT20 Mixed

WRT1900ACS SPARE r47608

WRT1900AC V1 5Ghz AC 80Mhz WDS-AP r48567
2.4Ghz AP Ch1 HT20 Mixed

WRT54G DD-WRT v3.0-r37305 micro AP CH 6 Mixed - Not in use

3200 Master -> LAN -> 1900ACS -> WDS 5Ghz -> 1900 V1 (X2)
3200 Master -> WDS -> 3200 Slave & 1900V1
blkt
DD-WRT Guru


Joined: 20 Jan 2019
Posts: 3897

PostPosted: Tue Feb 25, 2020 0:14    Post subject: Reply with quote
That solution involves creating a VAP, disabling WMM within the VAP and moving the problematic devices to it.

But I'm fairly certain the legacy rates will affect the entire 2.4Ghz network anyway. I haven't tested it myself.

The authentication spam in syslog tells you which device is struggling as it tells you its MAC address.

Introduce one device at a time while monitoring syslog (without any of these workarounds in effect).
Neil1454
DD-WRT User


Joined: 29 Jan 2012
Posts: 63

PostPosted: Tue Feb 25, 2020 1:23    Post subject: Reply with quote
blkt wrote:
That solution involves creating a VAP, disabling WMM within the VAP and moving the problematic devices to it.

But I'm fairly certain the legacy rates will affect the entire 2.4Ghz network anyway. I haven't tested it myself.

The authentication spam in syslog tells you which device is struggling as it tells you its MAC address.

Introduce one device at a time while monitoring syslog (without any of these workarounds in effect).


And which errors are the ones I'm looking out for in the syslog please ?

Thanks
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