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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@C0deape I can confirm the PX50 doesn't have the option (unless it is very well hidden in options) to assign a WAN port.
Anyway I'm being plagued by a problem that intermittently happens several/many times during the day when the entire network (wireless and wired) goes down for a second or two. I thought it was related to this thread and that during this down time my ISP (AT&T fiber perhaps temporarily went down). But like someone in this thread suggested to put the DECOs (including the "main" one) into access point mode and then introduce another router as the DHCP server. We'll, even in this setup I still get the annoying intermittent network is down.
And FYI I have my setup (both the original setup with the main deco as the DHCP server and latest setup where the DECOs are in AP MODE) with ethernet backhaul.
My previous setup was with the slower older ORBI. I had no issues with the same wired topology. I do have an unmanaged switch in play as well - I can't imagine that is a factor?!
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I've got PX50, X50-Outdoor, X50-4G and they all behave differently.
X50-4G has option to assign a port to WAN so 4g kicks in when its down.
PX50 has no option to specify WAN so it throws a wobbler if WAN isnt there.
From the forums I believe the X50 (not PX50) has a way to set the WAN port
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From elsewhere in this thread I believe the nature of the fix in the px50 is to allow you to use an advanced setting to assign a fixed WAN port and that will stop the autosensing.
Did you find such a setting?
T.
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I just setup a PX50 (1.0) a week ago. FW version = 1.2.2 Build 20231226 Rel. 74361. To confirm whether this has been fixed in the PX50, I unplugged the cable connected to the fiber modem and as reported in this thread, I lost access to my shared drives within my home network. So it doesn't appear to be fixed/optimized/etc with my setup.
I was getting intermittent "all devices/network are/is offline" for a second or two. While researching that issue I stumbled across this thread. I've seen other threads complaining about ATT fiber going offline for a second or two randomly during the day. I wonder if that coupled with this auto sensing is the cause of my intermittent network issues...
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@Sus_Deco How is the parental controls (ability to block devices from the internet) on those. That's the best feature of the Decos for me
Sus_Deco wrote
@TP-Link I agree with the latest poster. It doe NOT make sense for TP-Link to leave this bug in their devices AND tell the customer they can suck it up or go elsewhere.
I have now switched to Orbi and Asus and find the support great and the product even better. Worth paying the extra few dollars folks!
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@TimDan I'd also be interested in the answer to this. I imagine it would be fine. I'm largely unaffected by the issue. My Deco (in router mode) sits behind a Sonicwall which has WAN failover to 4G. However last week I got called downstairs as the 'internet' was off. Internet was fine for wired devices through the Sonicwall but Deco had confused itself over which was LAN and which was WAN. Had to disconnect the LAN cable, reboot Deco, wait for white light, then plug Deco back in to the LAN to fix. Just rebooting wouldn't cure it. Doesnt happen often enough to be a nuisance, but is an annoyance.
TimDan wrote
@TP-Link Just wondering. If the X50 model now has this problem fixed by allowing WAN port assignment, can I get a single X50 unit and replace my current main S4 Deco only. Will the X50 interoperatate with the remaining S4 units.
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@TP-Link Just wondering. If the X50 model now has this problem fixed by allowing WAN port assignment, can I get a single X50 unit and replace my current main S4 Deco only. Will the X50 interoperatate with the remaining S4 units.
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  @TimDan you couldn't unless you worked for TP-Link! It's a nuance of the firmware and not someone anyone sane would have thought to ask! 
  
it's like buying an ev and finding it doesn't work when disconnected from the charger! You'd not think to as as we'd all assumed Boone would be stupid enough to design it like that!
🤬🤬🤬🤬🤬🤬
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