@TP-Link 

Thanks very much....

Question, (looking to do more testing), does the "mesh" capability on the Deco X68 devices work when they are used as access point ? (I know other services like NAT and Parental Control do not but, if the MESH works in access point mode, I can still use the ISP provider modem as router and play with those settings.

Ideas?

@TP-Link 

Totally agree with that however, check these results from previous testing:

- Using only the main (third floor) and second floor devices (just two). Some of the devices I have in the basement still connect.

A- One computer (Linux computer I have in the basement running Plex) can also connect to the second floor Deco device. Speed test shows download speeds over 200+. This may be mainly because this is the only device with an 802.11AX NIC adapter. 

B- An Alexa device I also have in the basement (which only connects 2.4GHZ, can also connect but with browsing delays.

C- A Wireless Security Camera I have in the basement, can also connect but unstable connection.

Then, if I connect the third device directly in the basement (having it automatically connect to the main router in the third floor and bypassing the second floor one)

A- I have the Linux server connected to this device and the speed test drops to less than 150MB...

B- Same issues with the Alexa device

C- Same issues with the camera

So, it looks that, instead of improving, things go the opposite direction and the only thing I noticed was the source for the basement goes farther. Please note that I did not have issues with either device in the basement (security camera or Alexa device) when the Google Wifi AC1200 was used.

So, certainly something is not working properly and I notice that, when adding the third satellite, the second and third behave like a "wifi extender" and no "mesh" improvements are seen....

Not sure what issues could be affecting the third Deco, when it connects to the Main Deco because the app does not allow me to do any testing...

Also, being these units come in pairs, I have an extra one but don't want to replace any until I hear back fro TP Link on how to scan or troubleshoot the connectivity between the Deco devices...

@TP-Link 

Thanks for the reply. I ended up disconnecting the basement satellite and having everything going through the remainder two devices. Not the setup Iḿ looking as I still have some dead spots through the house but is the best one I can have for now.

Once the engineer connects to my computer, we can then troubleshoot other options.

@LER 

Hey, noticed browsing the community support site that it looks this is a very well known issue for Deco units. A whole bunch of people are experiencing the same (not able to daisy chain their units) which ends up affecting overall performance. 

What really surprises me is that they are being told that this will get fixed in the "next firmware update..." but it looks they are still waiting. 

Found topics fcoming all the way from 2020, affecting many different Deco models which don make me feel better....

Hope we can get it solved today.

Thanks

@TP-Link 

Another update.... Turning on/off the MESH option on some devices do not work. They keep jumping between different Deco devices. Issues keep coming...

@TP-Link 

Still pending to hear back from support in this issue. Below is a diagram of the current Deco placement through the house: with current and desired connection...

The "red" line is what is actually happening. and as a summary:

- If I remove the # 3 Deco, and try to have all clients connect to through only the #2 and #1, clients on the basement will have speeds up to 200+ Mb, however, not all clients will be able to connect due to dead zones.

- If I then add the # 3 in the basement, clients can connect but network speed drops between 100 to 150 MB but, noticed that the # 3 Deco always connects to the # 1 , bypassing entirelly # 2.

Waiting to hear back from support to "at the very least" "daisy chain" the systems for troubleshooting purposes before I change my mind on keeping these devices.

@TP-Link I have an X20 and 3 P9 Deco's. I want the  X20 to be the master to enable the best support for the AV and Parental controls, and the three P9's to be satelites around the house.  One P9 can be hard wired on Cat6, and the other 2 are in other parts of the house on the same UK ring main.  Setting the P9 as master the PLC backhaul is enabled, but setting the X20 it is not.  I want the three P9's that provide the satellite coverage to use PLC from the P9 with cat6, there does not seem to be a configuration that enables this, 

Is there any firmware options that allow P9 to backhaul between each other when satelites so that they link like this to maximise throughput.