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Dear community,

I have searched and tried a lot of things but none are working so far. Now I am lost, a bit ashamed too as I have computer - with a bit of network - background

Due to the architecture of my house, I have to chain switches. I bought 3 managed switches to have a proper configuration in the future, but right now it breaks my network.

Configuration is the following: Classic Internet box --> TL-SG108E "basement" --> TL-SG108E "tv" --> TL-SG108 "Desk"

- Each switch has several devices connected, for instance 1) in the basement I have 2 PCs used as NAS or 2) in the TV I have the TV, PlayStation or Apple TV and finally 3) desk I have 2 PC
- I upgraded to latest firmware each switch
- I have brand new cables, Maximum length of cable is 15 meter.
- Each switch is configured with DHCP setting : enabled
- I triple checked - I don't have cable loops (a cable plugged in the same switch)
- I use port 1 to plug the cable from where Internet arrives

Problem is the following:
- I have internet in the basement, but I don't have internet after (e.g. Tv, desk) - but within each switch devices are able to communicate (e.g. I can stream from my mac to the apple tv)
- When replacing "tv" by an unmanaged switch, I have internet everywhere. and there's no problem anymore.

it seems that TV and basement switches are not able to communicate together, as replacing TV by a basic one solves the issue.

I have tried, and played with configuration such as deactivating all VLANs . Without success.

I would be quite thankful for your help onn this.