Connection problem with 2.4 GHz

[mastum]

Hi, I compiled now with this commit https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=fe1244e04d45872f09f47b49465ca9367b4c8bd0

I have a problem with all my (5 five) Galaxy Tab A 2016, after only a minute the wireless clients remain connected but there is no access to the network. There are no errors in the kernel and system log.

Mon Feb  5 11:40:20 2018 daemon.info hostapd: wlan0: STA 34:14:5f:5b:3f:83 IEEE 802.11: authenticated
Mon Feb  5 11:40:20 2018 daemon.info hostapd: wlan0: STA 34:14:5f:5b:3f:83 IEEE 802.11: associated (aid 4)
Mon Feb  5 11:40:20 2018 daemon.notice hostapd: wlan0: AP-STA-CONNECTED 34:14:5f:5b:3f:83
Mon Feb  5 11:40:20 2018 daemon.info hostapd: wlan0: STA 34:14:5f:5b:3f:83 WPA: pairwise key handshake completed (RSN)
Mon Feb  5 11:40:20 2018 daemon.info dnsmasq-dhcp[2787]: DHCPDISCOVER(br-lan) 34:14:5f:5b:3f:83
Mon Feb  5 11:40:20 2018 daemon.info dnsmasq-dhcp[2787]: DHCPOFFER(br-lan) 192.168.11.88 34:14:5f:5b:3f:83
Mon Feb  5 11:40:20 2018 daemon.info dnsmasq-dhcp[2787]: DHCPREQUEST(br-lan) 192.168.11.88 34:14:5f:5b:3f:83
Mon Feb  5 11:40:20 2018 daemon.info dnsmasq-dhcp[2787]: DHCPACK(br-lan) 192.168.11.88 34:14:5f:5b:3f:83 Galaxy-Tab-A-2016

EDIT: Also iOS devices have this problem.

Xiaomi Router 3G OpenWrt SNAPSHOT r6006-fe1244e / LuCI Master (git-18.034.37656-e386d76)

Thanks

[lukasz1992]

I confirm on my notebook with Intel card. After a while (1 - 5 minutes) communication stops working.

[kofec]

On lede forum there was: I applied option disassoc_low_ack ‘0’ and option legacy_rates ‘0’ but I have no internet warnings on my android phone often.

[lumixen]

I can confirm that with the latest openwrt snapshot my Xiaomi Router 3G struggles with 2.4G connectivity issues as well. Periodically (1-5 mins), on my laptop with Intel-AC8260, Windows 10, 2.4 network connection just hangs. Some time after (1-5 mins) it may recover itself. It seems nothing interesting in the log when freeze happens. Meantime 5G works pretty stable.

Also I managed to do some iperf testing during the window when 2.4G network was accessible. Following setup: Laptop (client) --> 2.4G ---> Xiaomi router 3G --> 5G --> PC (Server).

Connecting to host 192.XXX.XXX.XXX, port 5201
[ 4] local 192.XXX.XXX.XXX port 59241 connected to 192.XXX.XXX.XXX port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 9.75 MBytes 81.7 Mbits/sec
[ 4] 1.00-2.00 sec 6.50 MBytes 54.5 Mbits/sec
[ 4] 2.00-3.00 sec 3.38 MBytes 28.3 Mbits/sec
[ 4] 3.00-4.00 sec 9.62 MBytes 80.9 Mbits/sec
[ 4] 4.00-5.00 sec 9.88 MBytes 82.8 Mbits/sec
[ 4] 5.00-6.00 sec 10.1 MBytes 84.9 Mbits/sec
[ 4] 6.00-7.00 sec 13.1 MBytes 110 Mbits/sec
[ 4] 7.00-8.00 sec 10.5 MBytes 87.9 Mbits/sec
[ 4] 8.00-9.00 sec 14.5 MBytes 122 Mbits/sec
[ 4] 9.00-10.00 sec 16.0 MBytes 134 Mbits/sec
[ 4] 10.00-11.00 sec 15.0 MBytes 126 Mbits/sec
[ 4] 11.00-12.00 sec 16.6 MBytes 139 Mbits/sec
[ 4] 12.00-13.00 sec 15.5 MBytes 130 Mbits/sec
[ 4] 13.00-14.00 sec 15.5 MBytes 130 Mbits/sec
[ 4] 14.00-15.00 sec 15.9 MBytes 133 Mbits/sec
[ 4] 15.00-16.00 sec 16.8 MBytes 141 Mbits/sec
[ 4] 16.00-17.00 sec 17.1 MBytes 144 Mbits/sec
[ 4] 17.00-18.00 sec 15.9 MBytes 133 Mbits/sec
[ 4] 18.00-19.00 sec 16.0 MBytes 134 Mbits/sec
[ 4] 19.00-20.00 sec 16.2 MBytes 136 Mbits/sec
[ 4] 20.00-21.00 sec 15.5 MBytes 130 Mbits/sec
[ 4] 21.00-22.00 sec 16.0 MBytes 134 Mbits/sec
[ 4] 22.00-23.00 sec 15.4 MBytes 129 Mbits/sec
[ 4] 23.00-24.00 sec 15.8 MBytes 132 Mbits/sec
[ 4] 24.00-25.00 sec 16.8 MBytes 140 Mbits/sec
[ 4] 25.00-26.00 sec 15.2 MBytes 128 Mbits/sec
[ 4] 26.00-27.00 sec 16.4 MBytes 137 Mbits/sec
[ 4] 27.00-28.01 sec 15.6 MBytes 130 Mbits/sec
[ 4] 28.01-29.00 sec 6.62 MBytes 56.2 Mbits/sec
[ 4] 29.00-30.00 sec 9.38 MBytes 78.6 Mbits/sec
[ 4] 30.00-31.00 sec 8.38 MBytes 70.3 Mbits/sec
[ 4] 31.00-32.00 sec 14.6 MBytes 123 Mbits/sec
[ 4] 32.00-33.00 sec 16.4 MBytes 137 Mbits/sec
[ 4] 33.00-34.00 sec 16.4 MBytes 137 Mbits/sec
[ 4] 34.00-35.00 sec 9.25 MBytes 77.6 Mbits/sec
[ 4] 35.00-36.00 sec 512 KBytes 4.19 Mbits/sec
[ 4] 36.00-37.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 37.00-38.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 38.00-39.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 39.00-40.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 40.00-41.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 41.00-42.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 42.00-43.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 43.00-44.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 44.00-45.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 45.00-46.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 46.00-47.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 47.00-48.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 48.00-49.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 49.00-50.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 50.00-51.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 51.00-52.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 52.00-53.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 53.00-54.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 54.00-55.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 55.00-56.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 56.00-57.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 57.00-58.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 58.00-59.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 59.00-60.00 sec 0.00 Bytes 0.00 bits/sec
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-60.00 sec 472 MBytes 66.0 Mbits/sec sender
[ 4] 0.00-60.00 sec 472 MBytes 66.0 Mbits/sec receiver

As you can see, when 2.4G is not frozen, I can get quite awesome speeds.

/etc/conf/wireless:

config wifi-device 'radio0' option type 'mac80211' option hwmode '11g' option path 'pci0000:00/0000:00:00.0/0000:01:00.0' option channel '4' option htmode 'HT40' option country '00' option noscan '1'

config wifi-iface 'default_radio0' option device 'radio0' option network 'lan' option mode 'ap' option encryption 'psk2+ccmp' option ssid '24G' option key

config wifi-device 'radio1' option type 'mac80211' option channel 'auto' option hwmode '11a' option path 'pci0000:00/0000:00:01.0/0000:02:00.0' option htmode 'VHT80'

config wifi-iface 'default_radio1' option device 'radio1' option network 'lan' option mode 'ap' option ssid '5G' option encryption 'psk2+ccmp' option key

OpenWrt SNAPSHOT r6009-a8b0232, mt76 - 8693864

[mastum]

Some time after (1-5 mins) it may recover itself.

Not for me... The problem seems only with 7603 and 7628

[pparent76]

I seem to have a similar problem with mt7603 with latest commit, even if it's hard for me to understand what happens. Connection seems to work very randomly, and have different results with different devices. I did not have this problem with previous commits.

[mastum]

I will test all commits to find the cause of the problem with 7603

[mastum]

@nbd168 I have find it, before this commit https://github.com/openwrt/mt76/commit/b0508d3044a2d469946347dfc020afb5cd0bac25

2.4 GHz is working fine on 7603

[pparent76]

Thanks a lot for your work!

[nbd168]

Thanks for tracking it down. I will look into it.

[lumixen]

@MaFeSa Thanks for the hint! Built locally with 58a41f1 and hangs are gone too.

[AspirinJunkie]

I have no ability to compile a version on my own. Is it expected that the fix will be included in a daily snapshot soon? Or can somebody (lumixen?) upload their fixed build?

[pparent76]

Question: How do you do to modify this file to compile a specific commit?

https://github.com/lede-project/source/blob/master/package/kernel/mt76/Makefile

I.e how do you calculate PKG_MIRROR_HASH for a specific commit?

[lumixen]

@AspirinJunkie could u try to use script from appropriate lede topic: https://forum.lede-project.org/t/xiaomi-wifi-router-3g/5377/544 ? It uses for build forked mt76 driver, with excluded all recent commits, related to CCMP PM validation.

[AspirinJunkie]

@lumixen thanks! i will give it a try. But before i have to get a linux to work on it ;-)

But anyway: We can expect that the fix will be included in the snapshots soon?

[lumixen]

@pparent76 I use sha256sum utility with downloaded package. Firstly, you change PKG_SOURCE_VERSION, then execute make ..path to package../prepare, then find the downloaded package in dl directory and calculate a new sha256sum. P.S. At least, I did so, though not sure if it is an correct approach -)

[lukasz1992]

@pparent76 Just delete this line, it will compile and build

[nbd168]

Fixed in the latest version

[mastum]

@nbd168 Thanks!

[lumixen]

@nbd168 works for me, thanks!

[pparent76]

Thanks a lot!

[AspirinJunkie]

Same here - now it works. Thanks!

[sweihub]

I have the same issue too with the latest 18.06.1 & 18.06.4 on my Xiaomi-mini router。The wifi stops working after some minutes, both 2.4G & 5G.

I had to downgrade to an old version (PandoraBox - base on OpenWRT 14.09) , now it seems stable.

Could anyone reopen the issue?

[kofec]

Xiaomi mini is using diffrent driver for 2,4G. I have the same router and I'm using master branch (https://downloads.openwrt.org/snapshots/targets/ramips/mt7620/openwrt-ramips-mt7620-xiaomi_miwifi-mini-squashfs-sysupgrade.bin) but compiled by myself. And I can recomend this build

Hostname    XiaomiMiniAP
Model   Xiaomi MiWiFi Mini
Architecture    MediaTek MT7620A ver:2 eco:6
Firmware Version    OpenWrt SNAPSHOT r11175-700e7a2eb9 / LuCI Master (git-19.281.57027-a154533)
Kernel Version  4.14.148

You can also try future stable branch: https://dl.eko.one.pl/luci/openwrt-19.07/ramips/mt7620/luci-19.07-snapshot-r10532-cf3b50377e-ramips-mt7620-miwifi-mini-squashfs-sysupgrade.bin

One more thing. Remember that upgrade takes a lot of time - sometimes more than 15 minutes. So be patience during upgrade.

[sweihub]

Hi Mr. Kofec, many thanks to your detailed instructions, I will stay tune to the future builds.

But I will stick to (PandoraBox - base on OpenWRT 14.09) for time being, it outperforms the original Xiaomi mini router firmware, it's stable and the signal is significantly great.