Accepted WAN/LAN auto-sensing

Background:
 There is a typical network topology:

Some users might notice that, once the internet service fails, they are no longer able to access the NAS server from the local network.
The cause of this Phenomenon:
 When internet service went down and the cable modem failed to provide an IP address for Main Deco, both Ethernet ports on the main Deco would work as WAN ports to detect internet connection. NAS would no longer obtain an IP address from Deco.
Why do we use WAN/LAN auto-sensing on Deco?
 For the Deco Mesh system, normally, it would have more than 2 units, and each unit has at least 2 Ethernet ports; It would be time-consuming and confusing to find out which port should be connected to the ISP modem. And supposing that the WAN port is fixed, once this port is broken, the whole Mesh kit would be useless.
Recommended Solutions:
- Given that the issue arises only when the ISP modem fails to assign an IP address for the main Deco, once the cable modem recovers, the problem should be resolved. It is suggested to contact the ISP to restore the modem connection as a priority.
- The current workaround would be connecting the wired servers to the satellite Deco units instead of the main one.
- And we have also implemented enhancements on certain models, ensuring that the WAN port remains constant as long as the physical Ethernet connection between the modem and main Deco is unchanged, even when there is no internet service from the modem. Moreover, it is also planned to support manually fixing a specific Ethernet port as the WAN post on the Deco APP later.
The following models already support fixing the WAN port:
| Deco X80-5G Deco X50-5G Deco X20-4G Deco X50/X55_V1/V1.2 Deco X20/X60_V4 Deco X60_V3/3.2/V4.2 | 1.11.0 Firmware Platform Understand the Differences Among Deco Firmware Platforms 
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@Tosoth I do not have that setting in my version of the app (AU version .83).
My Deco devices are in AP mode. Is it possible that the option to set WAN / LAN autosensing is only available when Deco units are router mode?
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Hi, my Deco X50 firmware version is 1.5.1 build 20240417.
I have polish version but In english this option is probably in:
More / Advanced / WAN port
My Deco app version is 3.7.83.
I don't know if it's more app version or firmware version that matters.
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Tosoth wrote
I got update for my Deco X50 yesterday. They added option to turn off Auto LAN/WAN sensing and set WAN port manually.
@Tosoth I use the latest version 3.7.74 of TP-Link Deco app for my Deco X50-PoE. Can't find the option to turn off Auto LAN/WAN sensing. Could you please advise where you found it in configuration menu?
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McMike wrote
Today i have made the slave deco the main and the main the slave in the app and switched locations, thinking maybe there was an issue with the main Deco. So far so good.
I've got a pair of M4 v1.0 that are wired backhaul to the ISP router. They've been great and up close can manage up to 400/400 up/down which is fast enough for my mobile devices.
However I recently added some Govee Wi-Fi lights that require LAN control for the Dreamview app on PC. They'd randomly drop LAN control, which requires multicast, with the mesh units but would stay solidly connected to the ISP router Wi-Fi albeit with a much weaker signal. That's when I discovered this issue.
So, I thought I'd try your suggestion of switching the mesh units main and slave. This has worked and I no longer have any more problems with Govee LAN control. Seems the mesh unit, in the pantry set as main, connected via ethernet directly to the ISP router causes an issue. Whereas the landing mesh unit set as main which goes through a switch then onto the ISP router doesn't with the pantry unit set as slave. Both are still using wired ethernet back to the ISP router just switched places as main/slave.

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@TP-Link Does anyone know if ANY models of the Deco have this issue / bug fixed?
I note that TP-Link do not even have the latest firmware 1.7.4 (AU) for the M5 Deco listed on their wesbsite. Too busy making money off later models to provide support to existing customers.
Still, the Orbo works and is MUCH cheaper than the TP-Link product.
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@Tosoth good, they are doing it but very very slowly. Been promised same for BE85, still waiting.
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I got update for my Deco X50 yesterday. They added option to turn off Auto LAN/WAN sensing and set WAN port manually.
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@ah1stb I've given up and have been buyinh g l i n e t products and build and configure my own wireless network. It's not mesh, but it does work through co-ordinated configuration screens and is based on open source software
silly spacing to avoid botnets preventing message being posted
ah1stb wrote
@silviun completley agree. I went with this mesh to simplify my home network for my wife and decrease signal congestion within the house. The WiFi works great and achieves the speeds I need. However, I am going with another product I am just tired of this not working, requiring numerous resets after power outages, my work VPN always dropping mid call. The best logs I capture indicate to me its the protocol being by CiscoAnyconnet (or whatever thew newer VPN is called nowadays). But there is no way to create rules to allow my specific work asset to allow the traffic without crowding the logs, which are actually pretty useless on the device anyway. I have decided I am going to go with a new solution since it has been a year and TP Link has failed to even respond other than support an RMA request which did nothing. Any suggestions on a "family frienly" solution? I like to have total administrative control and have extensive experience as a network engineer. Just need something with good WiFi to keep the kids happy, all of my connections are hard wired aside from wireless devices.
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@silviun completley agree. I went with this mesh to simplify my home network for my wife and decrease signal congestion within the house. The WiFi works great and achieves the speeds I need. However, I am going with another product I am just tired of this not working, requiring numerous resets after power outages, my work VPN always dropping mid call. The best logs I capture indicate to me its the protocol being by CiscoAnyconnet (or whatever thew newer VPN is called nowadays). But there is no way to create rules to allow my specific work asset to allow the traffic without crowding the logs, which are actually pretty useless on the device anyway. I have decided I am going to go with a new solution since it has been a year and TP Link has failed to even respond other than support an RMA request which did nothing. Any suggestions on a "family frienly" solution? I like to have total administrative control and have extensive experience as a network engineer. Just need something with good WiFi to keep the kids happy, all of my connections are hard wired aside from wireless devices.
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@TP-Link Please fix this ASAP! I dont know what PR do you have, what are your issues in your company but auto sensing MUST be optional! it is literally a flaw in the design, not a bug.
I cannot use my IOT bridges at all. I have Philips hue and aotec bridge which are disconnecting all the time. I simply cannot use them, randomly disconnects! I will post every week until this is resolved.
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