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#1 2023-02-10 18:04:50

michael8rown
Member
Registered: 2021-08-25
Posts: 27

[SOLVED] Public network not detected

I have a stubborn wireless problem I cannot seem to resolve. I am beginning to think that it's a router problem and not an Arch problem. I'm running Arch LTS with GNOME and my wifi card is working just fine. I use my wireless card at home all the time, but I'm currently in public and having trouble.

$ lspci -k
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
	Subsystem: Lenovo Z50-75
	Kernel driver in use: rtl8723be
	Kernel modules: rtl8723be
$ ip link
3: wlp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DORMANT group default qlen 1000

However, I cannot see (therefore cannot connect to) a known public wireless network. Let's call it "STATEGOV Public". I can see and connect to "STATEGOV Public" on my iPhone. I am also able to turn on personal hotspot on my iPhone which then shows up in Arch:

$ nmcli dev wifi
IN-USE  BSSID              SSID                        MODE   CHAN  RATE        SIGNAL  BARS  SECURITY 
*       ##:##:##:##:##:##  My iPhone                   Infra  6     130 Mbit/s  100     ▂▄▆█  WPA2  
        ##:##:##:##:##:##  DIRECT-94-HP M402 LaserJet  Infra  6     65 Mbit/s   47      ▂▄__  WPA2     
$ sudo iw dev wlp3s0 scan | grep SSID
      SSID: My iPhone

But I cannot see the public network "STATEGOV Public" that I want to connect to. I know it's a captive network, but I don't think that's the problem. Is it possible that the admins of the "STATEGOV Public" wifi network have configured it in such a way as to prevent Linux devices from connecting to it?

A little more information:

$ iw reg get
global
country 00: DFS-UNSET
	(755 - 928 @ 2), (N/A, 20), (N/A), PASSIVE-SCAN
	(2402 - 2472 @ 40), (N/A, 20), (N/A)
	(2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
	(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
	(5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
	(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
	(5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
	(5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
	(57240 - 63720 @ 2160), (N/A, 0), (N/A)

phy#0
country 99: DFS-UNSET
	(2402 - 2472 @ 40), (N/A, 20), (N/A)
	(2457 - 2482 @ 40), (N/A, 20), (N/A), PASSIVE-SCAN
	(5140 - 5360 @ 80), (N/A, 30), (N/A)
	(5460 - 5860 @ 80), (N/A, 30), (N/A)

I installed wireless-regdb and ran 

$ iw reg set US

with no success.

I have a feeling there is a simple fix, but I'm just not seeing it. Can anyone help?

Last edited by michael8rown (2023-02-13 13:06:00)

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#2 2023-02-10 18:56:20

Head_on_a_Stick
Member
From: The Wirral
Registered: 2014-02-20
Posts: 9,003
Website

Re: [SOLVED] Public network not detected

Can iwctl(1) see that network? Stop NetworkManager before trying iwd to prevent conflicts.

Jin, Jîyan, Azadî

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#3 2023-02-10 19:20:02

michael8rown
Member
Registered: 2021-08-25
Posts: 27

Re: [SOLVED] Public network not detected

Head_on_a_Stick wrote:

Can iwctl(1) see that network? Stop NetworkManager before trying iwd to prevent conflicts.

No. Here's the output:

$ iwctl device list
                                    Devices                                    
--------------------------------------------------------------------------------
  Name                  Address               Powered     Adapter     Mode      
--------------------------------------------------------------------------------
  wlp3s0                ##:##:##:##:##:##     on          phy0        station     

$ iwctl station wlp3s0 scan
[empty]

$ iwctl station wlp3s0 get-networks
                               Available networks                              
--------------------------------------------------------------------------------
      Network name                      Security            Signal
--------------------------------------------------------------------------------
No networks available

And just to double check, I took my laptop to lunch and tested wifi in actual public, which showed a bunch of networks:

IN-USE  BSSID              SSID                             MODE    CHAN  RATE        SIGNAL  BARS  SECURITY    
        2C:00:AB:5B:48:20  ATT4SPjXYs                       Infra   4     195 Mbit/s  100     ▂▄▆█  WPA2        
        3C:DF:A9:7C:B4:80  ATT9m3Y7A2                       Infra   11    130 Mbit/s  100     ▂▄▆█  WPA2        
        60:22:32:22:6C:3A  Swift Guest                      Infra   11    540 Mbit/s  70      ▂▄▆_  WPA2        
        62:22:32:12:6C:3A  --                               Infra   11    540 Mbit/s  70      ▂▄▆_  WPA2        
        94:FF:3C:D9:EE:A0  Capitol Cafe Guest               Infra   6     260 Mbit/s  69      ▂▄▆_  WPA2        
        98:1E:19:54:B3:36  MySpectrumWiFi30-2G              Infra   1     195 Mbit/s  67      ▂▄▆_  WPA2        
        A0:63:91:86:62:81  ACECTX                           Infra   4     195 Mbit/s  67      ▂▄▆_  WPA2        
        7A:8A:20:54:04:81  TAHP-Guest                       Infra   6     195 Mbit/s  67      ▂▄▆_  WPA2        
        94:FF:3C:D9:EE:A1  Cafe Internal                    Infra   6     260 Mbit/s  65      ▂▄▆_  WPA2        
        2C:30:33:E2:64:E1  Freedom Center                   Infra   1     195 Mbit/s  64      ▂▄▆_  WPA2        
        02:2F:BF:B1:DD:AD  HP0159CD                         Ad-Hoc  10    11 Mbit/s   64      ▂▄▆_  --          
        08:D5:9D:02:4E:26  919 2.4G                         Infra   11    195 Mbit/s  64      ▂▄▆_  WPA2        
...

Does this sound more like a router problem than a laptop problem?

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#4 2023-02-10 19:27:47

Scimmia
Fellow
Registered: 2012-09-01
Posts: 13,727

Re: [SOLVED] Public network not detected

Those are all 2.4GHz channel numbers, you don't seem to be finding any 5GHz networks. Is the network you're looking for 5GHz only?

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#5 2023-02-10 19:48:19

michael8rown
Member
Registered: 2021-08-25
Posts: 27

Re: [SOLVED] Public network not detected

I don't know. I'm actively connected to this network on my iPhone: do you know if there is a way to find out which channel it's on from there?

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#6 2023-02-10 20:09:19

michael8rown
Member
Registered: 2021-08-25
Posts: 27

Re: [SOLVED] Public network not detected

Actually, yes, I believe it is a 5GHz network I'm trying to connect to. Here's information directly from the router:

AP radio: 2
Band: 5GHz
Channel: 140 (40 MHz wide)
Mode: 802.11ac

Looking further down the page, I also see:

2.4 GHz Channel 1 utilization: 0%
5 GHz Channel 140 utilization: 1%

It is possible that the wifi card in my laptop only works on 2.4 GHz signals?

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#7 2023-02-10 20:19:34

michael8rown
Member
Registered: 2021-08-25
Posts: 27

Re: [SOLVED] Public network not detected

Running 

iw list

I see 

Frequencies:
             * 2412 MHz [1] (20.0 dBm)
             * 2417 MHz [2] (20.0 dBm)
             * 2422 MHz [3] (20.0 dBm)
             * 2427 MHz [4] (20.0 dBm)
             * 2432 MHz [5] (20.0 dBm)
             * 2437 MHz [6] (20.0 dBm)
             * 2442 MHz [7] (20.0 dBm)
             * 2447 MHz [8] (20.0 dBm)
             * 2452 MHz [9] (20.0 dBm)
             * 2457 MHz [10] (20.0 dBm)
             * 2462 MHz [11] (20.0 dBm)
             * 2467 MHz [12] (20.0 dBm)
             * 2472 MHz [13] (20.0 dBm)
             * 2484 MHz [14] (disabled)

And that's it. So I'm guessing that means my card won't connect to this network, right?

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#8 2023-02-10 20:31:36

seth
Member
From: Won't reply 2 private help req
Registered: 2012-09-03
Posts: 76,387

Re: [SOLVED] Public network not detected

https://www.realtek.com/en/products/com … /rtl8723be
"Right" sad

How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

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#9 2023-02-13 13:07:06

michael8rown
Member
Registered: 2021-08-25
Posts: 27

Re: [SOLVED] Public network not detected

Over the weekend I replaced my wifi card. Now I can see (and connect to) that 5Ghz public network. Thanks for your help!

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