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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So this is probably why I cannot locally access my Jellyfin server without internet? I'll be renovating soon and will have to tear down the entire living room (ISP router will be removed) and thought I could still have all my content available, so to test I unplugged my ISP cable from the main M9plus and my local server wasn't serving anymore :( What a shame.
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connecting the wired devices to the satellite deco's doesn't work. Neither does introducing another router and using the decos merely as access points. None of the workarounds work!!
and this issue has been present for approaching 3 years now.
tplink are willfully selling a product that is not fit for purpose!
inam replacing the decos in the main house with gl.iNet routers and access points because of this issue and have stopped recommending pr buying any tplink products because of the arrogant ignoring of hundreds of customers concerns over this product.
i have emailed the ceo and the uk ceo through LinkedIn and concluded they are utterly oblivious and ignore their clients as their profiles are virtually and my messages have been ignored
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Exactly the same issue on deco be85.
Serously, I don't understand the time use by tp link before taking in charge this issue.
I hope it will be fixe asap, it's a CRITICAL issue.
Regards
erreur404
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@TP-Link Please fix this.
I only have one main Deco X20 (no satellites). I have the modem and one switch connected to the Ethernet ports of the Deco. When internet goes down, all the wired devices (connected to the switch) stop working. I can't access to my NAS anymore.
PLEASE ALLOW US TO SET A FIXED WAN PORT. Make that option Advanced if you want. But it's really unacceptable to lose LAN connectivity when internet goes down, it just doesn't make any sense.
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I've been hampered by a variation of this issue these last few days. My Deco M4 pair have given a couple of years of great service. The Parental Control features in router mode are great so I never wanted to go AP mode. I've ended up in double nat territory to keep the features. No biggie.
On Wednesday I was watching Kodi around lunchtime and the film stopped. The NAS was uncontactable from my phone. I thought it was the NAS so went off up into the loft to check but it was pingable from another server so not dead.
Earlier that day I'd seen that the slave deco was offline and had gone to WiFi backhaul, then would go offline again. I removed the ethernet backhaul cable and plugged in a laptop to the cable. Got a 169. address. Something up with the cable or switch was my first thought. Or the Vlans needed for Guest WiFi had gone bad.
There was also an available firmware update which i applied. Didn't fix problem.
Fast forward several hours and lots of cable pulling and googling for "wired clients don't get ip address from Deco, but wireless do" and "wired clients isolation" and I stumbled upon this thread.
So in my scenario, wireless clients could access the internet with no issues (so internet was available) but wired clients could not, even with available internet. And wireless clients could not see wired clients, even those with static ip addresses. And vice versa.
I was able to, temporarily, resolve the issue (thanks to this thread) by switching the lan ports around on the main deco when the problem occurs. Presumably this resolves the autosense problem being discussed here. I had less success in just removing and reconnecting the ethernet cables... that would work occasionally ... but swapping then around fixes immediately.
Removing the slave deco entirely from the setup did not resolve the issue. Issue had returned by the next day. At least I had a workaround of swapping the cables.
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'm am seeing that the Deco App can't find the network from time to time without a reboot, but the internet and wired to wireless connectivity is looking better (for now) and no drops
Not sure I'll be sticking with Deco going forward though. Does anyone know of a mesh that has similar parental controls but better configurability of vlans, ssids etc. at a similar price point?
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