Tablets lose connection constantly WDR3600v1

Installing and Using OpenWrt
1

Hello,
i'm having an issue that's racking my brain, i have some tablets that are constantly getting disconected, both of them are 2.4Ghz, one is a very old asus eee transformer TF100(android 4) and the other is a chinese logicom CT1800(android 7) and the connection to the AP fails constantly, it drops, then comes back then drops.
And sometimes it directly won't connect anymore, it sees the ssid, but trying to connect does nothing
Other devices have NO issues, notebooks, cell phones, etc, both tablets are in the same room as the AP and are 2.4Ghz only.

setup is:
WDR3600v1 with 19.07.4 installed, running as AP only.
2.4 and 5Ghz networks have different SSID, and 2.4Ghz has 2 SSID(the 2nd SSID is because i've ran into issues that several older notebooks won't connect to a SSID that a space in them, so i had to make a single-word ssid).
All of them are running in WPA2 CCMP mode.

Things i've tried:
changing beacon interval to 200
changed distance to 100(was 30 before) as i've read in the forum(an old post) that values below 100 did nothing)
enabling/disabling KRACK and 802.11w (only have them enabled in the 5G radio atm)
changing channels after doing a scan, auto channels, no difference.

not a thing made a difference.

here's my wireless config:

cat /etc/config/wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option hwmode '11g'
        option path 'platform/ahb/18100000.wmac'
        option htmode 'HT20'
        option channel 'auto'
        option legacy_rates '0'
        option country 'AR'
        option beacon_int '200'
        option distance '100'

config wifi-device 'radio1'
        option type 'mac80211'
        option hwmode '11a'
        option path 'pci0000:00/0000:00:00.0'
        option channel 'auto'
        option noscan '1'
        option legacy_rates '0'
        option htmode 'HT40'
        option distance '30'
        option txpower '18'
        option country 'AR'

config wifi-iface 'wifinet2'
        option network 'lan'
        option ssid 'MAST 24'
        option encryption 'psk2+ccmp'
        option device 'radio0'
        option mode 'ap'
        option key 'xxxxxxxx'

config wifi-iface 'wifinet3'
        option ssid 'MAST 50'
        option encryption 'psk2+ccmp'
        option device 'radio1'
        option mode 'ap'
        option key 'xxxxxxxxxx'
        option network 'lan'
        option wpa_disable_eapol_key_retries '1'
        option ieee80211w '1'

config wifi-iface 'wifinet4'
        option network 'lan'
        option encryption 'psk2+ccmp'
        option device 'radio0'
        option mode 'ap'
        option key 'xxxxxxxxxxxx'
        option ssid 'mast'

the system log shows connection after connection(DF:FE is the CT1080 tablet):

Thu Nov 19 13:46:30 2020 daemon.info hostapd: wlan0: STA dc:78:34:07:df:fe IEEE 802.11: authenticated
Thu Nov 19 13:46:30 2020 daemon.info hostapd: wlan0: STA dc:78:34:07:df:fe IEEE 802.11: associated (aid 5)
Thu Nov 19 13:46:31 2020 daemon.notice hostapd: wlan0: AP-STA-CONNECTED dc:78:34:07:df:fe
Thu Nov 19 13:46:31 2020 daemon.info hostapd: wlan0: STA dc:78:34:07:df:fe WPA: pairwise key handshake completed (RSN)
Thu Nov 19 13:48:05 2020 daemon.notice hostapd: wlan0: AP-STA-DISCONNECTED dc:78:34:07:df:fe
Thu Nov 19 13:48:05 2020 daemon.info hostapd: wlan0: STA dc:78:34:07:df:fe IEEE 802.11: authenticated
Thu Nov 19 13:48:05 2020 daemon.info hostapd: wlan0: STA dc:78:34:07:df:fe IEEE 802.11: associated (aid 5)
Thu Nov 19 13:48:05 2020 daemon.notice hostapd: wlan0: AP-STA-CONNECTED dc:78:34:07:df:fe
Thu Nov 19 13:48:05 2020 daemon.info hostapd: wlan0: STA dc:78:34:07:df:fe WPA: pairwise key handshake completed (RSN)

i have no idea what's going on

2

just try to set on openwrt router encryption from wpa2 to wpa/wpa2 mixed mode.

3

Try a fixed channel instead of auto. Do some scans to identify the neighbors, then choose the channel from the group 1, 6, 11 which has the least strong neighbors.

Distance is only relevant for long range links more than 2 kilometers. It loosens some timeouts to allow time for radio waves to travel the distance. Do not set it at all for indoor use.

1 Like
4

i've already set a fixed channel, tried the 1/6/11 and there's no change.

so far it seems changing to wpa/wpa2 MIXED seems to be working