Xiaomi ax3600 - Cannot connect between local clients that are connected to same wifi radio

Installing and Using OpenWrt
1

I have Xiaomi AX3600 with newest Openwrt installed about 2 weeks ago. I usually ssh from my phone connected with wifi to my desktop pc, connected over wifi too.

I have setup both AX3600 radios using same SSID and 802.11r. Additionally on the 2.4 GHZ radio I have addional SSID to be able to manually connect to 2.4 GHZ when i am further from wifi as it works better than default SSID with 802.11r.

However i have noticed that when i restart the router everything works ok. But after about half day - day, I cannot connect over ssh to my desktop pc from my phone (5GHZ wirelesss -> 5GHZ wireless). But I can ssh to the router just ok (5GHZ wirelesss -> wired). I have also noticed that when I switch my phone to 2.4 GHZ SSID, I can ssh to the desktop pc again (2.4GHZ wirelesss -> 5GHZ wireless).

This is an issue also because i have multiple Amazon Echoes and they cannot see each other and i cannot use multiroom audio too.

I have also followed this older topic Clients in same WLAN can't reach each other - #30 by skids and added option
option multicast_to_unicast 0
to all radios, but it didnt help.

2 
root@OpenWrt:~# ubus call system board 
{
	"kernel": "5.15.127",
	"hostname": "OpenWrt",
	"system": "ARMv8 Processor rev 4",
	"model": "Xiaomi AX3600",
	"board_name": "xiaomi,ax3600",
	"rootfs_type": "squashfs",
	"release": {
		"distribution": "OpenWrt",
		"version": "23.05.0-rc3",
		"revision": "r23389-5deed175a5",
		"target": "ipq807x/generic",
		"description": "OpenWrt 23.05.0-rc3 r23389-5deed175a5"
	}
}

root@OpenWrt:~# cat /etc/config/network

config interface 'loopback'
	option device 'lo'
	option proto 'static'
	option ipaddr '127.0.0.1'
	option netmask '255.0.0.0'

config globals 'globals'
	option ula_prefix 'fd67:e3a3:94b0::/48'
	option packet_steering '1'

config device
	option name 'br-lan'
	option type 'bridge'
	list ports 'lan1'
	list ports 'lan2'
	list ports 'lan3'

config interface 'lan'
	option device 'br-lan'
	option proto 'static'
	option ipaddr '192.168.1.1'
	option netmask '255.255.255.0'
	option ip6assign '60'
	option multicast_to_unicast '0'

config interface 'wan'
	option device 'wan'
	option proto 'dhcp'

config interface 'wan6'
	option device 'wan'
	option proto 'dhcpv6'

root@OpenWrt:~# cat /etc/config/wireless

config wifi-device 'radio0'
	option type 'mac80211'
	option path 'soc/20000000.pci/pci0000:00/0000:00:00.0/0000:01:00.0'
	option channel 'auto'
	option band '2g'
	option htmode 'HT20'
	option country 'AT'
	option cell_density '0'
	option disabled '1'

config wifi-device 'radio1'
	option type 'mac80211'
	option path 'platform/soc/c000000.wifi'
	option channel 'auto'
	option band '5g'
	option htmode 'HE160'
	option cell_density '0'
	option country 'AT'

config wifi-device 'radio2'
	option type 'mac80211'
	option path 'platform/soc/c000000.wifi+1'
	option channel 'auto'
	option band '2g'
	option htmode 'HE40'
	option cell_density '0'
	option country 'AT'

config wifi-iface 'wifinet3'
	option device 'radio0'
	option mode 'ap'
	option ssid 'REDACTED'
	option encryption 'psk-mixed'
	option key 'REDACTED'
	option network 'lan'
	option disabled '1'

config wifi-iface 'wifinet4'
	option device 'radio1'
	option mode 'ap'
	option ssid 'REDACTED'
	option encryption 'psk2'
	option key 'REDACTED'
	option network 'lan'
	option ieee80211r '1'
	option mobility_domain '1234'
	option ft_over_ds '0'
	option ft_psk_generate_local '1'
	list maclist 'REDACTED'

config wifi-iface 'wifinet5'
	option device 'radio2'
	option mode 'ap'
	option ssid 'REDACTED'
	option encryption 'psk2'
	option key 'REDACTED'
	option network 'lan'
	option ieee80211r '1'
	option mobility_domain '1234'
	option ft_over_ds '0'
	option ft_psk_generate_local '1'
	option macfilter 'deny'
	list maclist 'REDACTED'

config wifi-iface 'wifinet6'
	option device 'radio2'
	option mode 'ap'
	option ssid 'REDACTED 2400Mhz'
	option encryption 'psk2'
	option key 'REDACTED'
	option network 'lan'
3

I fixed that on my dynalink by turning on wifi isolation and then turning it off, try that?

4

Thanks, tried it, but it didnt help. Cannot connect 5GHZ client -> 5GHZ client at all now. With disabled client isolation. 2.4 GHZ -> 5GHZ works.