Beacon numbers for radiation/congestion reduction settings.

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danielwritesback
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PostPosted: Mon Jun 10, 2019 5:57    Post subject: Beacon numbers for radiation/congestion reduction settings. Reply with quote
See attached chart for valid beacon interval numbers. The prime numbers aren't masked by or collide with other wifi access points.

For rf sensitive people, longer time in-between 2.4ghz beacons, such as 293, prevents headache.

Other tip, Try DTIM set to 2 to enable phone and tablet power saving. Preventing wake-locks saves battery and reduces wifi congestion.

See also https://play.google.com/store/apps/details?id=com.pzolee.wifiinfo Wifi Network Analyzer phone app--you probably don't want the 2.4ghz signal more than halfway up the scale if measured from your bedroom.



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SinCalChewy
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PostPosted: Fri Jun 28, 2019 20:54    Post subject: Reply with quote
This post has been super helpful, as I'm in an apartment complex with lots of signals flying around.

My only question: I have client bridges on my network to the gateway. I have the beacon interval set there, and currently on my client bridges as the same. Should client bridges have the same interval? Or is it better off having a different interval than the gateway?

DTIM at 2 has helped a lot as well. Just wondering about the client bridge interval issue.

TIA! Smile

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kernel-panic69
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PostPosted: Mon Jul 01, 2019 9:55    Post subject: Reply with quote
Setting 2.4GHz band to 293 and 5GHz band to 241 seems to be working good on my E4200 v1. I left the GTK renewal at the default of 3600 and so far, NO ISSUES, save and except for the first couple of hours of uptime after I had to de-brick after a bad flash on 40167. Currently still using 40065 K3.x mega.
tinkeruntilitworks
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PostPosted: Tue Jul 02, 2019 16:29    Post subject: Reply with quote
i would get some errors that would accumulate over time. always still "100%" though. never noticable.

i adjusted the beacons to primes and the dtim to 2. i haven't seen any errors since it's been up and running.

for some reason when my phone first connects it sends packets that are errors. then it quickly resolves the issue.

those initial errors are all I've seen. thanks for posting
bushant
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PostPosted: Tue Jul 02, 2019 17:35    Post subject: Reply with quote
More about which prime numbers to use:
https://www.dslreports.com/forum/r14241618-Theory-on-Optimizing-a-802-11-Beacon

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dTX
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PostPosted: Thu Jul 04, 2019 15:26    Post subject: Reply with quote
DEV's,make this post Sticky please. It's very informative and beneficial to everyone here.I also had no idea about the proper interval numbers.
danielwritesback thanks for posting this !!!!

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danielwritesback
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PostPosted: Mon Dec 23, 2019 22:27    Post subject: Reply with quote
SinCalChewy wrote:
...I'm in an apartment complex with lots of signals flying around.
...
Just wondering about the client bridge interval issue.

For an apartment with wifi congestion, CTS to auto and lowering the RTS value could help. Lower RTS costs some throughput but reduces lag, and can get more range for 5ghz. Theoretically, the setting could be done at clients or access points; but, it is usually done at the access point.

Client-mode specific WL commands exist but they aren't represented in the user interface; and, clients don't beacon. So, generally, those settings are done at the access point.
danielwritesback
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PostPosted: Mon Oct 26, 2020 14:27    Post subject: Reply with quote
Another source of congestion is junk packets. CVE-2019-11477 CVE-2019-11478 CVE-2019-11479
To fix, you can use:
iptables -t mangle -A PREROUTING -p tcp -m conntrack --ctstate NEW -m tcpmss ! --mss 536:65535 -j DROP
msoengineer
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PostPosted: Mon Oct 26, 2020 15:19    Post subject: Reply with quote
For the moment, the following is what is recommended:

Use 300 for the beacon interval for the primary radio you want seen first (5ghz most likely). DTIM should be 1.

Use 400 for the other radio if you have a router with two radios. DTIM should also be 1.

Enable RTS/CTS and then set the separate box for threshold to 784.

mtu=1500 bytes divide by half to yield 750 plus 34 bytes for overhead = 784.

prime numbers for BI may prove problematic for some client devices and YMMV if you use a prime number. 300-600 is the "sweet spot" for beacon interval vs. client power consumption. 300 seems to be a BI time unit recommended by advanced network guru's.

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itwontbewe
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PostPosted: Mon Oct 26, 2020 17:06    Post subject: Reply with quote
R7000P here
the RTS/CTS looks different than your qca settings

do i just set rts threshold to 784 and leave the rest as is? is the fragmentation threshold related to it as well?
msoengineer
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PostPosted: Mon Oct 26, 2020 19:49    Post subject: Reply with quote
Set both thresholds to 784.
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itwontbewe
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PostPosted: Mon Oct 26, 2020 20:34    Post subject: Reply with quote
thank you
mac913
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PostPosted: Mon Oct 26, 2020 22:15    Post subject: Reply with quote
msoengineer wrote:
For the moment, the following is what is recommended:

Use 300 for the beacon interval for the primary radio you want seen first (5ghz most likely). DTIM should be 1.

Use 400 for the other radio if you have a router with two radios. DTIM should also be 1.

Enable RTS/CTS and then set the separate box for threshold to 784.

mtu=1500 bytes divide by half to yield 750 plus 34 bytes for overhead = 784.

prime numbers for BI may prove problematic for some client devices and YMMV if you use a prime number. 300-600 is the "sweet spot" for beacon interval vs. client power consumption. 300 seems to be a BI time unit recommended by advanced network guru's.


Thanks for the good info. Made the changes to all 3 sites in my Signature. I will report back...

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mrjcd
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PostPosted: Mon Oct 26, 2020 22:55    Post subject: Reply with quote
just a note --
all my brcm WAPs & Gateways I have:
Fragmentation Threshold 1792
RTS Threshold 1792

AND also

all QCA units - gateways & WAPs:
Protection Mode RTS/CTS
RTS Threshold Enabled
Threshold 1792

has worked very well for me for couple years
msoengineer
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PostPosted: Tue Oct 27, 2020 0:09    Post subject: Reply with quote
I think anything set higher than 1500 will make no difference for wifi to wan traffic. For wifi to lan that 1792 might still be useful, but wan traffic is 1500 bytes or less making 1792 similar to 2346...
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FORUM RULES

TIPS/TRICKS: Best QCA Wifi Settings | Latency tricks | QoS Port priority | NEVER USE MU-MIMO |
Why to NOT use MU-MIMO | Max Wifi Pwr by Country | Linux Wifi Pwr | AC MCS & AX MCS | QCA 5Ghz chnls to use | WIFI Freq WIKI | TFTP R7800 | Don't buy AX | IPERF3 How-To

[R9000]45478 nightly (Main Router)
[EA8500]43192 & 45417 (2xOffsite)
[R7800]napping
[WDR3600]BS 44715 (Offsite)
[A7v5]BS 43038 (Offsite+spare napping)
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