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#1 2019-09-24 20:35:00

Hybrid Son Of Oxayotl
Member
Registered: 2010-07-09
Posts: 56

Unable to detect specific wifi networks anymore

I noticed that my laptop is now absolutely unable to detect my WiFi networks (it detects other networks just fine), while it previously had no problem doing it, and it still can do it from my Windows and Ubuntu installs on the same laptop.
I did check the regulatory domain, and it is set correctly (France).
I am usually using NetworkManager in Gnome, but for test purposes I tried using iw dev wlp3s0 scan instead.
Here is what I find when typing that command in Ubuntu:

BSS e4:9e:12:d4:79:fc(on wlp3s0) -- associated
	TSF: 218939276 usec (0d, 00:03:38)
	freq: 2412
	beacon interval: 96 TUs
	capability: ESS Privacy ShortSlotTime (0x0411)
	signal: -38.00 dBm
	last seen: 0 ms ago
	Information elements from Probe Response frame:
	SSID: Freebox-4A6B1F
	Supported rates: 1.0* 2.0* 5.5* 11.0* 22.0 6.0 9.0 12.0 
	DS Parameter set: channel 1
	ERP: Barker_Preamble_Mode
	Extended supported rates: 18.0 24.0 36.0 48.0 54.0 
	RSN:	 * Version: 1
		 * Group cipher: CCMP
		 * Pairwise ciphers: CCMP
		 * Authentication suites: PSK
		 * Capabilities: 16-PTKSA-RC 1-GTKSA-RC (0x000c)
	HT capabilities:
		Capabilities: 0xec
			HT20
			SM Power Save disabled
			RX HT20 SGI
			RX HT40 SGI
			TX STBC
			No RX STBC
			Max AMSDU length: 3839 bytes
			No DSSS/CCK HT40
		Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
		Minimum RX AMPDU time spacing: No restriction (0x00)
		HT TX/RX MCS rate indexes supported: 0-23, 32
	HT operation:
		 * primary channel: 1
		 * secondary channel offset: no secondary
		 * STA channel width: 20 MHz
		 * RIFS: 0
		 * HT protection: no
		 * non-GF present: 1
		 * OBSS non-GF present: 0
		 * dual beacon: 0
		 * dual CTS protection: 0
		 * STBC beacon: 0
		 * L-SIG TXOP Prot: 0
		 * PCO active: 0
		 * PCO phase: 0
	Extended capabilities:
		 * Operating Mode Notification
	WMM:	 * Parameter version 1
		 * BE: CW 15-1023, AIFSN 3
		 * BK: CW 15-1023, AIFSN 7
		 * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
		 * VO: CW 3-7, AIFSN 2, TXOP 1504 usec
[…]
BSS e4:9e:12:d4:79:fd(on wlp3s0)
	TSF: 218939283 usec (0d, 00:03:38)
	freq: 2412
	beacon interval: 96 TUs
	capability: ESS ShortSlotTime (0x0401)
	signal: -34.00 dBm
	last seen: 0 ms ago
	Information elements from Probe Response frame:
	SSID: FreeWifi
	Supported rates: 1.0* 2.0* 5.5* 11.0* 22.0 6.0 9.0 12.0 
	DS Parameter set: channel 1
	ERP: Barker_Preamble_Mode
	Extended supported rates: 18.0 24.0 36.0 48.0 54.0 
	HT capabilities:
		Capabilities: 0xec
			HT20
			SM Power Save disabled
			RX HT20 SGI
			RX HT40 SGI
			TX STBC
			No RX STBC
			Max AMSDU length: 3839 bytes
			No DSSS/CCK HT40
		Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
		Minimum RX AMPDU time spacing: No restriction (0x00)
		HT TX/RX MCS rate indexes supported: 0-23, 32
	HT operation:
		 * primary channel: 1
		 * secondary channel offset: no secondary
		 * STA channel width: 20 MHz
		 * RIFS: 0
		 * HT protection: no
		 * non-GF present: 1
		 * OBSS non-GF present: 0
		 * dual beacon: 0
		 * dual CTS protection: 0
		 * STBC beacon: 0
		 * L-SIG TXOP Prot: 0
		 * PCO active: 0
		 * PCO phase: 0
	Extended capabilities:
		 * Operating Mode Notification
	WMM:	 * Parameter version 1
		 * BE: CW 15-1023, AIFSN 3
		 * BK: CW 15-1023, AIFSN 7
		 * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
		 * VO: CW 3-7, AIFSN 2, TXOP 1504 usec
BSS e4:9e:12:d4:79:fe(on wlp3s0)
	TSF: 218939286 usec (0d, 00:03:38)
	freq: 2412
	beacon interval: 96 TUs
	capability: ESS Privacy ShortSlotTime (0x0411)
	signal: -33.00 dBm
	last seen: 0 ms ago
	Information elements from Probe Response frame:
	SSID: FreeWifi_secure
	Supported rates: 1.0* 2.0* 5.5* 11.0* 22.0 6.0 9.0 12.0 
	DS Parameter set: channel 1
	ERP: Barker_Preamble_Mode
	Extended supported rates: 18.0 24.0 36.0 48.0 54.0 
	RSN:	 * Version: 1
		 * Group cipher: TKIP
		 * Pairwise ciphers: CCMP TKIP
		 * Authentication suites: IEEE 802.1X
		 * Capabilities: 16-PTKSA-RC 1-GTKSA-RC (0x000c)
	HT capabilities:
		Capabilities: 0xec
			HT20
			SM Power Save disabled
			RX HT20 SGI
			RX HT40 SGI
			TX STBC
			No RX STBC
			Max AMSDU length: 3839 bytes
			No DSSS/CCK HT40
		Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
		Minimum RX AMPDU time spacing: No restriction (0x00)
		HT TX/RX MCS rate indexes supported: 0-23, 32
	HT operation:
		 * primary channel: 1
		 * secondary channel offset: no secondary
		 * STA channel width: 20 MHz
		 * RIFS: 0
		 * HT protection: no
		 * non-GF present: 1
		 * OBSS non-GF present: 0
		 * dual beacon: 0
		 * dual CTS protection: 0
		 * STBC beacon: 0
		 * L-SIG TXOP Prot: 0
		 * PCO active: 0
		 * PCO phase: 0
	Extended capabilities:
		 * Operating Mode Notification
	WMM:	 * Parameter version 1
		 * BE: CW 15-1023, AIFSN 3
		 * BK: CW 15-1023, AIFSN 7
		 * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
		 * VO: CW 3-7, AIFSN 2, TXOP 1504 usec

(I removed networks that are detected but aren't mine)
Running the same command on ArchLinux gives me a lot of networks in common, but none of those three.
Any idea what might be the cause?

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#2 2019-09-24 21:00:50

seth
Member
Registered: 2012-09-03
Posts: 60,970

Re: Unable to detect specific wifi networks anymore

Are any 2.4GHz networks among the detected ones?

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#3 2019-09-24 22:10:46

Hybrid Son Of Oxayotl
Member
Registered: 2010-07-09
Posts: 56

Re: Unable to detect specific wifi networks anymore

If that's the “freq: 2412” line, then yes. I'm detecting networks with freq: 2412, freq: 2437 and freq: 2462.

Last edited by Hybrid Son Of Oxayotl (2019-09-24 22:10:58)

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#4 2020-07-10 21:14:34

seth
Member
Registered: 2012-09-03
Posts: 60,970

Re: Unable to detect specific wifi networks anymore

Semi-Necrobump, but https://bbs.archlinux.org/viewtopic.php … 4#p1914874 could be relevant.

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