Crappy Wifi link speed d-link dir-868L

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silveria
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Joined: 13 Jan 2023
Posts: 32

PostPosted: Sun Jan 15, 2023 13:29    Post subject: Crappy Wifi link speed d-link dir-868L Reply with quote
New to dd-wrt. My router is DIR-868L, my client is D-Link DWA-172 Wireless AC600 Dual Band USB Adapter with Signal Plus attached to a PC. Paying and getting stable 100Mbps internet from my provider. With default D-link firmware the link speed is:

2.4Ghz: 150Mbps
5Ghz: 350Mbps

With DD-WRT v3.0-r51288 std (01/12/23) the link speed is:

2.4Ghz: 72Mbps
5Ghz: 200Mbps

When I run speedtest.net I still get the full 100Mbps, but wondering why the lower link speed?

I read through Wiki/Basic_Wireless_Settings and made some changes but that didn't improve anything. Specifically implementing the changes in the Sticky thread "BCM Best Wifi Settings" things got extremely worse, dropping wifi connection, barely 10Mbps download speed.

Currently reverted to default wifi settings for build v3.0-r51288. Would appreciate any suggestions!
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ho1Aetoo
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Joined: 19 Feb 2019
Posts: 2927
Location: Germany

PostPosted: Sun Jan 15, 2023 14:02    Post subject: Reply with quote
If you don't configure your WLAN correctly, you won't get fast transfer rates.

In the 2.4Ghz band, only over 100Mbit can be achieved with one antenna if you use 40Mhz channel width.

150Mbit = 40Mhz 802.11n 1x1 64-QAM
433Mbit = 80Mhz 802.11ac 1x1 256-QAM

and your 72Mbit is pretty sure 20Mhz channel width
silveria
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Joined: 13 Jan 2023
Posts: 32

PostPosted: Sun Jan 15, 2023 14:31    Post subject: Reply with quote
ho1Aetoo wrote:
If you don't configure your WLAN correctly, you won't get fast transfer rates.

In the 2.4Ghz band, only over 100Mbit can be achieved with one antenna if you use 40Mhz channel width.

150Mbit = 40Mhz 802.11n 1x1 64-QAM
433Mbit = 80Mhz 802.11ac 1x1 256-QAM

and your 72Mbit is pretty sure 20Mhz channel width


You would be surprised, my 2.4Ghz is 72Mbps irrelevant of whether 20/40 Mhz. It's currently 40Mhz and still connects at 72Mbps. As for 5Ghz, the 80Mhz channel performs the worse for me, it connects on 180Mbps when on it. Also as far as I know this model router has six internal antennas.

Anything else?
ho1Aetoo
DD-WRT Guru


Joined: 19 Feb 2019
Posts: 2927
Location: Germany

PostPosted: Sun Jan 15, 2023 14:40    Post subject: Reply with quote
It does not matter how many antennas the router has.
Your client only has 1 antenna, so it can only connect to 1 antenna.

don't use the dynamic 20/40mhz mode but directly "wide 40Mhz" also it can be that you have to deactivate "fatchannel intolerance" in the drivers of your client.

Edit: Turbo-QAM could still increase the data rate, if supported by router and client

80Mhz AC allow as said 433Mbit linkrate with 1 antenna.
But there are more settings that play a role like the network mode and also the selected channel.

We don't know what your settings are so we can't make any recommendations.
silveria
DD-WRT Novice


Joined: 13 Jan 2023
Posts: 32

PostPosted: Sun Jan 15, 2023 15:18    Post subject: Reply with quote
ho1Aetoo wrote:
It does not matter how many antennas the router has.
Your client only has 1 antenna, so it can only connect to 1 antenna.

Ok that makes sense!

ho1Aetoo wrote:

don't use the dynamic 20/40mhz mode but directly "wide 40Mhz" also it can be that you have to deactivate "fatchannel intolerance" in the drivers of your client.


There is no dynamic setting, only 20 or 40 and it's on 40Mhz. I do not have "fatchannel intolerance" setting in the wifi client drivers.

ho1Aetoo wrote:

Edit: Turbo-QAM could still increase the data rate, if supported by router and client


Where should I look for this setting? Didn't find it in basic and advanced wireless settings

ho1Aetoo wrote:

80Mhz AC allow as said 433Mbit linkrate with 1 antenna.
But there are more settings that play a role like the network mode and also the selected channel.
We don't know what your settings are so we can't make any recommendations.


I've attached screenshots of my settings and channel view.



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ho1Aetoo
DD-WRT Guru


Joined: 19 Feb 2019
Posts: 2927
Location: Germany

PostPosted: Sun Jan 15, 2023 15:57    Post subject: Reply with quote
well best not to use "auto channel".
We have also had reports in the broadcom forum that "auto channel" ignores the channel width (e.g. instead of the set 80Mhz only 40Mhz is used).

But you can actually see this in the "Status > WLAN" tab
There is also displayed for each client individually what channel width is used.

Edit:

same wifi chip >>

https://barbados.desertcart.com/products/46801566-merkmak-mini-wireless-dual-band-802-11-ac-portable-usb-wi-fi-5-ghz-2-4-ghz-433-mpbs-adapter-rtl-8811-au-for-win-7-8-10-mac-linux

Quote:
802.11n: (20MHz)MCS0-7,up to 72Mbps at most(40MHz)MCS0-7,up to
150Mbps at most
802.11ac:Max 433Mbps(80MHz)
silveria
DD-WRT Novice


Joined: 13 Jan 2023
Posts: 32

PostPosted: Sun Jan 15, 2023 16:53    Post subject: Reply with quote
ho1Aetoo wrote:
well best not to use "auto channel".
We have also had reports in the broadcom forum that "auto channel" ignores the channel width (e.g. instead of the set 80Mhz only 40Mhz is used).


AND that was the problem!! Thank you kindly sir, you're my hero! After changing from Auto to a channel I get the results I expect:



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silveria
DD-WRT Novice


Joined: 13 Jan 2023
Posts: 32

PostPosted: Sun Jan 15, 2023 17:16    Post subject: Reply with quote
@ho1Aetoo On second thought the router itself is still not up to specs i.e. it is a Dual-band Wireless AC1750 (1,300 Mbps on 5 GHz + 450 Mbps on 2.4 GHz) and as you can see from screenshots it only gets 866Mbsp on 5 Ghz and 144 Mbps on 2.4 Ghz and these are the numbers on the router, not on the client wifi card. There my connection is at 150Mbps @ 2.4Ghz and 433Mbps @ 5Ghz I am aware that those numbers are probably theoretical maximums, but 144 out of 450 on the 2.4 Ghz is low. Do you have any thoughts on that?
ho1Aetoo
DD-WRT Guru


Joined: 19 Feb 2019
Posts: 2927
Location: Germany

PostPosted: Sun Jan 15, 2023 17:24    Post subject: Reply with quote
it shows some nonsense there on broadcomm routers.
further down the clients are listed and there is for each client individually the RX/TX rate and the channel info displayed.

The RX/TX rate always depends on whether the client is currently transmitting or in PS (Powersafe).

The info above is some nonsense ... never found out what is displayed there.
But I don't own a Broadcom router anymore and on the other routers from Atheros, Marvel, Ralink the maximum bitrate is indeed displayed there.
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