@aatp 

The answer to your first question is "yes." 

Check this TP-Link FAQ document: How to extend guest network when there is a switch between Decos

This document discusses how to configure managed switch to support Guest Network. You said yours is TL-SG1024. As far as I can tell, TP-Link sells both managed and unmanaged switch under that model name, so double check which one you've got.

  @Alexandre. Thank you for your reply and for the link provided, which is very relevant.

The behaviour I'm experiencing seems consistent with a managed switch where the vlan tagging has not been set up properly, therefore satellite decos are behaving strangely.

I will check if the switch is managed or unmanaged. If it's unmanaged then there should be nothing to set up and I'll remain confused. Fingers crossed the switch is the managed version!

  @aatp I´m having the same issue, devices can't get ip address from guest network from the sattelite DECOs.

I'm using 4x M5 with unmanaged tp-link switch between them, but it's only possible to access to the guest Wi-Fi if I do it on the primary DECO M5. If I try it near the sattelites DECOS, I get no assign IP address.

All of my DECO M5 are running updated firmware version 1.7.4 Build 20231222 Rel. 63684

  @David-TP 

Thanks for your reply. The unmanaged tp-link switch model is LS1005S -- 10/100/1000 -- 5 ports.
 

I have configured the 4x Deco M5 as instructed by the manufacturer:
-- First I connected one M5 to WAN, configured WiFi, defined as main router, etc.
-- Thus I wired the others 3x Deco M5 via the unmanaged switch to the main M5 and let it found and configure them automatically as satellites (no issues).

Everything works fine except the guest network when trying to connect via the satellites M5s as I have mentioned in my previous post. Users are able to connect to the main WiFi network via any M5, wireless coverage is great and mesh works perfectly as well.

This issue in the guest network is our pain point given these Deco M5 are installed in a church. Our objective is to have the main WiFi used for admin personnel/streaming only and offer the guest network for general users -- which is not possible today.  

I will make the test via wireless as you stated and let you know the results.

  @asilvaju 

same case with me, HP unmanaged switch, Deco X50-5G as the main router, and three X20. Main network without problems, Guest network same symptoms as you described.

Hi I'm having the same issue...main unit is Deco BE63, with 4 XE75Pro & another BE63 as satellites. I've tried 2 different switches, both unmanaged, and neither worked, that is, with the guest network on the satellites. What worked was when I set one of the satellites wireless, was able to connect to the guest network on that. I would of course prefer to keep the satellites hooked up with ethernet (since I just added new cat6 wiring throughout the house), especially since it's a concrete house so wifi really has a tough time spreading out. Anyway, thanks in advance for any help. (Btw, all units with updated firmware as of 6.19.2024)

  @asilvaju Try to Update Deco Units and then reboot Deco Units. Same problem with me, works fine now. Hope this helps

  @Gentle_Mark he tried reboot and reconfig. I did too, same problem here. Deco E4, unmanaged TPLink switch. Everything up to date.

Tried connecting without switch; guest had no internet connection. Now, with switch, new devices can't get IP from satellite Deco guest network.