Date: Tue, 19 Aug 2025 19:49:08 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Adrian Chadd <adrian@freebsd.org> Cc: wireless@freebsd.org Subject: Re: rtwn/rtl8821au: strange issue with 5GHz channels Message-ID: <b7453c2b-13dc-4864-a899-2cfaf36bc5b1@FreeBSD.org> In-Reply-To: <9243aad2-20d1-4c17-8f9a-f5b682eb1f85@freebsd.org> References: <4cb1c608-d534-4bfb-8cc9-92251000e0fd@FreeBSD.org> <CAJ-VmonQ7x%2BX=g5Gd4ZsJ1Ku3uTNKBEH34D=n8Xnw1nkAKudrw@mail.gmail.com> <9243aad2-20d1-4c17-8f9a-f5b682eb1f85@freebsd.org>
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On 19/08/2025 18:33, Andriy Gapon wrote:
> Weird thing... I set the AP to 20MHz:
> # iw dev phy1-ap1 info
> Interface phy1-ap1
> ifindex 28
> wdev 0x10000000b
> addr 7a:d2:94:80:1f:ec
> ssid HolyLan
> type AP
> wiphy 1
> channel 149 (5745 MHz), width: 20 MHz, center1: 5745 MHz
> txpower 20.00 dBm
> multicast TXQ:
> qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-
> bytes tx-packets
> 0 0 67 0 0 0 0 20434
> 67
>
> Then I reset the client and tried again and it still wants to use channel 153:
>
> wpa_supplicant[16180]: wlan0: Trying to associate with 7a:d2:94:80:1f:ec
> (SSID='HolyLan' freq=5765 MHz)
> wpa_supplicant[16180]: wlan0: Authentication with 7a:d2:94:80:1f:ec timed out.
> wpa_supplicant[16180]: wlan0: Added BSSID 7a:d2:94:80:1f:ec into ignore list,
> ignoring for 10 seconds
> wpa_supplicant[16180]: wlan0: CTRL-EVENT-DISCONNECTED bssid=7a:d2:94:80:1f:ec
> reason=3 locally_generated=
After a couple of dozens of retries the correct channel / frequency was finally
selected and connection was successfully established.
But it looks like the connection is 'a', not 'ac' that I expected?
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=200001<RXCSUM,RXCSUM_IPV6>
ether 08:be:ac:3e:a9:ee
inet 192.168.0.130 netmask 0xffffffff broadcast 192.168.0.130
groups: wlan
ssid HolyLan channel 149 (5745 MHz 11a) bssid 7a:d2:94:80:1f:ec
regdomain NONE country UA indoor authmode WPA2/802.11i privacy ON
deftxkey UNDEF AES-CCM 2:128-bit txpower 23 bmiss 7 mcastrate 6
mgmtrate 6 scanvalid 60 wme roaming MANUAL
parent interface: rtwn0
media: IEEE 802.11 Wireless Ethernet OFDM/36Mbps mode 11a
status: associated
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
Log:
wpa_supplicant[2564]: wlan0: Trying to associate with 7a:d2:94:80:1f:ec
(SSID='HolyLan' freq=5745 MHz)
wpa_supplicant[2564]: wlan0: Associated with 7a:d2:94:80:1f:ec
wpa_supplicant[2564]: wlan0: WPA: Key negotiation completed with
7a:d2:94:80:1f:ec [PTK=CCMP GTK=CCMP]
wpa_supplicant[2564]: wlan0: CTRL-EVENT-CONNECTED - Connection to
7a:d2:94:80:1f:ec completed [id=0 id_str=]
kernel: wlan0: link state changed to UP
--
Andriy Gapon
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