Wifi Scanner reports different channels than R7000?

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zakazak
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Joined: 27 Aug 2011
Posts: 32

PostPosted: Thu May 25, 2017 13:15    Post subject: Wifi Scanner reports different channels than R7000? Reply with quote
Hello everyone,

for a few weeks I have wifi problems (2.4GHz). So I thought I would change my channel to auto and play around with the channel width.

Now I noticed that the R7000 status oage reports that the channels 11+9 are in usage but wifi-scanner on android reports 11+7.

Maybe this weirdness is causing my wifi freezes + drops? But if so, how to fix it?

R7000 with latest stable Kong.
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Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 6858
Location: Romerike, Norway

PostPosted: Thu May 25, 2017 16:33    Post subject: Reply with quote
If you are in Europe set channel 13 + lower. In the US this channel is not legal. The result is 11+13, but you have to check what your neighbours are using first. In a crowded environment, set 20Mhz width.
zakazak
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Joined: 27 Aug 2011
Posts: 32

PostPosted: Thu May 25, 2017 16:58    Post subject: Reply with quote
Per Yngve Berg wrote:
If you are in Europe set channel 13 + lower. In the US this channel is not legal. The result is 11+13, but you have to check what your neighbours are using first. In a crowded environment, set 20Mhz width.


Ye I am from europe and I had 13+lower+40Hz which ended up with 13+9 I think.

The place is really crowded...I now chose 13+20Hz (then the lower/upper option disappears) and it seems to work better.

The channels that my neighbors are using are switching all the time. But it seems like no one is using 13. 1,6,7,11 are the most used ones.

14 would be best (according to wifi analyzer) but I am not sure if all devices support channel 14?

Also channel width 20Hz makes the transfer speeds slower than they would be with 40Hz?
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 6858
Location: Romerike, Norway

PostPosted: Thu May 25, 2017 18:10    Post subject: Reply with quote
Channel 14 is only legal in japan.

Channel 13 is overlapping with channel 11.
The only non overlapping channels is 1,6,11 (with 20Mhz only)

Consider moving to 5Ghz.
zakazak
DD-WRT Novice


Joined: 27 Aug 2011
Posts: 32

PostPosted: Thu May 25, 2017 19:16    Post subject: Reply with quote
Per Yngve Berg wrote:
Channel 14 is only legal in japan.

Channel 13 is overlapping with channel 11.
The only non overlapping channels is 1,6,11 (with 20Mhz only)

Consider moving to 5Ghz.


5Ghz does not cover the whole area.

I thought overlapping depends on how big the channel width is?

So far 13 with 20Mhz seems to be working good.
Xeon2k8
DD-WRT Guru


Joined: 11 Feb 2016
Posts: 1288

PostPosted: Fri May 26, 2017 10:40    Post subject: Reply with quote
zakazak wrote:
Per Yngve Berg wrote:
Channel 14 is only legal in japan.

Channel 13 is overlapping with channel 11.
The only non overlapping channels is 1,6,11 (with 20Mhz only)

Consider moving to 5Ghz.


5Ghz does not cover the whole area.

I thought overlapping depends on how big the channel width is?

So far 13 with 20Mhz seems to be working good.

As explained here
http://www.metageek.com/training/resources/adjacent-channel-congestion.html

Choose less crowded 1,6 or 11. Not 13.

_________________
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Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 6858
Location: Romerike, Norway

PostPosted: Fri May 26, 2017 11:32    Post subject: Reply with quote
zakazak wrote:
Also channel width 20Hz makes the transfer speeds slower than they would be with 40Hz?


Think of it as the 20Mhz as a slow vehicle that goes from A to B without stopping. You are passed by a fast car (40Mhz), but it have to stop at the red light in the next crossing and you catch up before the lights get green.
zakazak
DD-WRT Novice


Joined: 27 Aug 2011
Posts: 32

PostPosted: Fri May 26, 2017 21:50    Post subject: Reply with quote
Xeon2k8 wrote:
zakazak wrote:
Per Yngve Berg wrote:
Channel 14 is only legal in japan.

Channel 13 is overlapping with channel 11.
The only non overlapping channels is 1,6,11 (with 20Mhz only)

Consider moving to 5Ghz.


5Ghz does not cover the whole area.

I thought overlapping depends on how big the channel width is?

So far 13 with 20Mhz seems to be working good.

As explained here
http://www.metageek.com/training/resources/adjacent-channel-congestion.html

Choose less crowded 1,6 or 11. Not 13.


But 1,6,11 are the most crowded ones in my network where as 13 isnt used by anyone.

And I cant fix on e.g. channel 1 (which me the least crowded from the three) because the other routers seem to use "automatic" and always switch around.

In that case DD-WRT needs an option to "auto between 1,6,11".

I read the article but I am still not sure why 1,6,11 would still be better than 13 when each of the three channels is used by 4 other routers but 13 not beeing used by anyone?
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 6858
Location: Romerike, Norway

PostPosted: Sat May 27, 2017 6:18    Post subject: Reply with quote
13 overlap adjacent with 11. To use 13, 11 have to be free.
zakazak
DD-WRT Novice


Joined: 27 Aug 2011
Posts: 32

PostPosted: Sat May 27, 2017 7:55    Post subject: Reply with quote
Per Yngve Berg wrote:
13 overlap adjacent with 11. To use 13, 11 have to be free.


Alright I think I got it.

Well I am now on channel 1 which sometimes is the least crowded one out of 1,6,11. but the other wifis just jump around channels like crazy and sonetimes 1 ends up being the worst.

I think dd-wrt could really profit from a "auto 1,6 or 11" mode.
HalfBit
DD-WRT Guru


Joined: 04 Sep 2009
Posts: 776
Location: AR, USA

PostPosted: Sun May 28, 2017 11:01    Post subject: Reply with quote
Don't you want to go around and knock on all your neighbors doors, educate them on wireless security, and channel congestion, then coordinate and say you use channel 1, you use channel 6, you use 11, you use 1, you 6, you 11. Get the pattern here people??

You at the end of the block, start with 1, etc. etc..

But then again this all goes out the window with multi tenant housing when you get into multiple floors etc.. Then you do as suggested and be one of the few networks, or maybe the only network using the 5ghz band amongst your shared airspace.

_________________
R7000 Nighthawk - DD-WRT v3.0-r50308
R7000 Nighthawk - DD-WRT v3.0-r50308
~~~~~~~~~~Dismantled for learning opportunities~~~~~~~~~~
WRT54Gv2
WRT54Gv8.2
~~~~~~~~~~Other Settings~~~~~~~~~
https://nextdns.io/?from=2d3sq39x
https://pi-hole.net/
https://github.com/DNSCrypt/dnscrypt-proxy
zakazak
DD-WRT Novice


Joined: 27 Aug 2011
Posts: 32

PostPosted: Sun May 28, 2017 14:41    Post subject: Reply with quote
HalfBit wrote:
Don't you want to go around and knock on all your neighbors doors, educate them on wireless security, and channel congestion, then coordinate and say you use channel 1, you use channel 6, you use 11, you use 1, you 6, you 11. Get the pattern here people??

You at the end of the block, start with 1, etc. etc..

But then again this all goes out the window with multi tenant housing when you get into multiple floors etc.. Then you do as suggested and be one of the few networks, or maybe the only network using the 5ghz band amongst your shared airspace.


Nah... I currently see 12x 2,4ghz wifis. There are 3 apartements in each floor. And it seems like some ppl are even running two different 2.4ghz wifis at the same tine lol.

The faster approach would be to crack their wifi pw, router pw and then change it myself -.-



Every 10 seconds either 1 or 6 or 11 becomes the prefered channel. On the screenshot above it might look like channel 6 is best but that will change in just a few secondy/minutes.

When taking the screenshot I set 4 steps away from my R7000 (my wifi is named "Simy").
HalfBit
DD-WRT Guru


Joined: 04 Sep 2009
Posts: 776
Location: AR, USA

PostPosted: Mon May 29, 2017 14:20    Post subject: Reply with quote
zakazak wrote:
The faster approach would be to crack their wifi pw, router pw and then change it myself -.-


So true...

_________________
R7000 Nighthawk - DD-WRT v3.0-r50308
R7000 Nighthawk - DD-WRT v3.0-r50308
~~~~~~~~~~Dismantled for learning opportunities~~~~~~~~~~
WRT54Gv2
WRT54Gv8.2
~~~~~~~~~~Other Settings~~~~~~~~~
https://nextdns.io/?from=2d3sq39x
https://pi-hole.net/
https://github.com/DNSCrypt/dnscrypt-proxy
zakazak
DD-WRT Novice


Joined: 27 Aug 2011
Posts: 32

PostPosted: Tue May 30, 2017 12:58    Post subject: Reply with quote
Well I just figured out that my 5GHz has a better range than my 2,4GHz as there are no other 5GHz wifi's broadcasting.

What a joke really Very Happy
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