Hey there,

 

first, my other devices that may affect this setup:

 

- Switch: SG3218XP-M2 v1.0, Firmware 1.0.3

- AP #1: EAP650-Wall(EU) v2.0, Firmware 1.0.1

- AP #2: EAP655-Wall(EU) v1.0, Firmware 1.2.7

- Controller: OC200 v1.0, Firmware: 5.7.6

 

I do have a couple of Wi-Fi's and VLANs configured. A few of those work (like my main two Wi-Fis (luckily!)), but a couple don't. My setup:

 

VLANs:

- Private, ID: 1, Subnet 10.42.0.1

- Guests, ID: 100, Subnet 10.42.100.1

- IoT, ID: 200, Subnet 10.42.200.1

- OldDevices, ID: 300, Subnet 10.42.30.1

 

Wi-Fi's (name's are changed for privacy reasons):

- Private: My main / private Wi-Fi. No VLAN configured, as this will make the Wi-Fi unusable (that's another issue I have, but that's for another day...)

- Guests: Guest network, also has the "Guest network" checkbox ticked, VLAN ID 100

- IoT: For all IoT devices, VLAN ID 200

- OldWiFi2.4: I recently moved and renamed my Wi-Fis, but for old IoT devices that are partly hard to factory reset, I re-created the two old Wi-Fis for them so I can 1-by-1 then move them over. VLAN ID: 300

- OldWiFi5: See above. VLAN ID: 300

 

The issue is with the Wi-Fi's "Guests", "OldWiFi2.4" and "OldWiFi5", or VLANs 100 and 300 respectively.

Wi-Fi's "Private" and "IoT" / VLANs 1 and 200 work as intended.

 

The issue is that only iPhones seem to be able to obtain an IP address. Android devices (including my own, tested five different), my Windows 11 Laptop and some old IoT devices are unable to obtain an IP address.

My own device can connect to my "Private" Wi-Fi, but not to "Guests", "OldWiFi2.4" and "OldWiFi5".

 

And yes, I googled the issue and I found this thread, but that was not really leading to a solution: https://community.tp-link.com/en/business/forum/topic/578868

 

I tried several things already:
- Recreating the Wi-Fi: No success

- Recreating the VLAN: No success

- Force provision the two APs: No success

- Force provision the router: No success

- Force provision the switch: No success. However, when I did this, it was unable to adopt the switch again, saying the user credentials had changed!? I tried "admin/admin" and adopted it ¯\_(ツ)_/¯

- Change the VLAN IDs: No success

- Don't have a VLAN set to the affected Wi-Fis: SUCCESS, this will make the Wi-Fi work with non-iPhones... But that's not the solution :D

- Changing the VLAN: SUCCESS: See above

 

I'm really out of ideas. I quadruple-checked the configs of those Wi-Fis and VLANs, I can't spot an issue. The VLAN profiles are anyways read-only; I can't change / break them. And I do have working Wi-Fi's and VLANs, but those refuse to work...

 

Thanks already and greetings,

 

Andy!