Greetings 👋

 

Setup:

 

Router: Zyxel Keenetic

Switch: Umanaged TP-Link TL-SG1016D

Controller: Self-hosted Omada Controller v4.2.4

AP: TP-Link EAP 225 v3

 

2 subnets on Router: 

 

- Home Network (default, 192.168.1.0/26, VLAN 1, VLAN Acess 4 Port)

- IOT Network (192.168.2.0/25, VLAN 10, VLAN Trunk 4 Port)

 

2 wireless networks on Omada Controller:

 

- Home Network. 2.4 GHz + 5 GHz, WPA2/3, Rate Control, default VLAN (no configured VLAN).

- IOT Network. No SSID broadcast, 2.4 GHz, WPA2, No Rate Control, VLAN 10)

 

Devices connected to IOT Network via AP(s):

 

- Multiple ESP8266

- Smart Bulbs

- Multiple Air Conditioners (AC)

 

Issue

 

After some time (4-30 hours), all devices connected to WiFi IOT network stop respond on brodcast requests. Confirmed via running wireshark on router. 

 

- ARP. No response.

- mDNS. No response.

- ICMP (ping). Response if source has mac address in ARP table.

 

Broadcast packets between devices inside IOT subnet connected via switch go without any problems.

 

Did try:

 

- Source Device <-> AP Wifi "IOT Network"

- Source Device <-> Switch

- Source Device <-> AP WiFi "Home Network" (devices don't respond to router ARP packets as well)

 

Example (Wireshark dump):

 

on 192.168.2.27 running `ping 192.168.2.10`

 

 

Curious thing is router (192.168.2.1) did respond on ARP from AC (192.168.2.10).

 

What doesn't help:

 

- Reboot switch.

- Reboot router.

- Connect AP directly to router.

 

What helps for short time in some cases:

 

- Reconnect unavailable devices.
- Reboot unavailable devices.

 

What helps:

 

- Reboot AP(s).

 

 

Topology

 

 

 

Any ideas?