Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

Ok so probably a pretty dumb question but I can't figure out why my Archer C20i seems to be blocking stuff in the network and how to stop it from doing that.

This is our setup:

we have a modem from our tv/internet company
from that we have a line to a splitter (?) out of which 3 lines go to wall sockets in the rest of the house.
when I plug a computer directly into one of those sockets I have internet, no problem
I have two Archer C20I's plugged in as well to provide wifi. This works just fine.

Now, the problem is that when I am connected via wifi to one of the archers I have internet but can't see other computers and devices in the network. When using the computer that is directly plugged into a wall socket I see other devices (such as a samsung tv and an apple tv) just fine. So that leads me to believe something in the Archer is blocking viewing other devices but can't find what. I have tried disabling the SPI firewall but no luck there.

Can anybody help me out?