[R2S Plus] [Upstream] Can't ping hosts connected to the same br-lan side

[Plaque-fcc]

Hardware: R2S Plus with RTL8822CS WiFi card.
Software: Linux 6.1.63 #1 SMP Fri Mar 29 11:26:33 CST 2024 aarch64 GNU/Linux; FriendlyWrt: OpenWrt 23.05.3 r23809-234f1a2efa / LuCI b07cf9dcfc37e021e5619a41c847e63afbd5d34a branch git-24.088.58402-5be51dc.

I configure a 5 GHz wireless interface phy0-ap0 without client isolation.
I connect three wireless clients to this AP,

1. I can ping the AP IPv4 address from these clients.
2. I can ping the clients from the router CLI via SSH.
3. I can access the internets with this router.
4. For some reason, I can't ping one client from another on the same br-lan network, on the same phy0-ap0 AP.
5. Additionally, I can ping between eth1 and wlan clients.

What may be the cause of this problem?

[Plaque-fcc]

Update: openwrt/openwrt#8159

[tramchamploo]

Do you manage to solve it by method mentioned in the openwrt issue?

[Plaque-fcc]

Do you manage to solve it by method mentioned in the openwrt issue?

Is not a solution, it is a workaround. And yes, it works.

[tramchamploo]

Unfortunately not for me.

[Plaque-fcc]

Unfortunately not for me.

Why not?

This is my case:

# diff /lib/netifd/netifd-wireless.sh{-orig,} --context=5
*** /lib/netifd/netifd-wireless.sh-orig	Wed Jan  8 20:00:19 2025
--- /lib/netifd/netifd-wireless.sh	Sun Dec 29 23:33:27 2024
***************
*** 304,313 ****
--- 304,314 ----
  	local isolate
  
  	json_get_vars isolate proxy_arp
  
  	[ ${isolate:-0} -gt 0 -o -z "$network_bridge" ] && return
+ 	multicast_to_unicast=0
  	[ ${multicast_to_unicast:-1} -gt 0 -o ${proxy_arp:-0} -gt 0 ] && json_add_boolean isolate 1
  }
  
  for_each_interface() {
  	local _w_types="$1"; shift

[tramchamploo]

Cause I was doing like here by specifying in config file manually. Yours is working. Can't figure out why. Maybe a bug when retrieving this value.