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No LAN connectivity when internet is down

No LAN connectivity when internet is down

No LAN connectivity when internet is down
No LAN connectivity when internet is down
a week ago
Model: Deco XE75  
Hardware Version: V1
Firmware Version:

Hi, I believe the title explains it all. I have nothing fancy except a local Adguard Home installation, which is configured as a DNS server on the LAN level (in DHCP settings). Everything else is set to default, and I have approximately 25 clients, most of whom are connected via Ethernet through a TPLink switch.

 

When the internet connection fails, the LAN connection also goes down. Consequently, I am unable to ping 192.168.68.203 from 192.168.68.204 since they are both connected via cable. I have tried rebooting the Deco’s, removing the DNS settings, but nothing has resolved the issue. However, when I reboot the internet modem, everything returns to normal, including the LAN connection. The Ethernet cable from my ISP is connected to the first Ethernet port.

 

I spent the entire morning trying to understand what’s happening, and it’s quite frustrating. How can I ensure that I have a LAN connection even when there’s no internet connection? 

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#1
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5 Reply
Re:No LAN connectivity when internet is down
a week ago

  @osmanu 

 

Hi, thanks for posting question here.

As Ethernet ports of Deco support WAN/LAN auto-sensing, when internet is on, one port work as WAN port and other ports work as LAN ports automatically.

When internet is off, the auto-sensing fails, that may affect connection between LAN devices.

May I confirm your exact network topology? (also including the model of the network devices)

Thank you and best regards.

 

 

 

 

 

Check Out the Latest Posts: Archer GE550 - BE9300 Tri-Band Wi-Fi 7 Gaming Router EasyMesh Is Available When Wi-Fi Routers Work in AP Mode as A Controller. Archer BE550 New Software Enhances System Stability and Optimizes MLO Network Stability. TL-WA3001 Supports EasyMesh, Speed Limit, Guest Network in AP Mode and/or Multi-SSID Mode.
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#2
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Re:No LAN connectivity when internet is down
a week ago

  @Marvin_S 

 

I have a 3 Deco X75 v1, they all wirelessly connected and operating in router mode. First Ethernet port of Deco connected to the Arris tg3429lg modem, other two connected to two TL-SG108E switches. Most of the switch ports are utilized by wired devices. 
 

Thanks in advance. 

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#3
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Re:No LAN connectivity when internet is down
a week ago
@Marvin_S I have same problem here on deco be25. Any solution to disable auto wan port?
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#4
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Re:No LAN connectivity when internet is down
a week ago

  @osmanu 

 

Hi, to assist you efficiently, I've forwarded your case to the TP-Link support engineers who will contact you with your registered email address later. Please pay attention to your email box for follow-up.

Welcome to update solution here if your concern is resolved.

Thank you and happy new year!

Check Out the Latest Posts: Archer GE550 - BE9300 Tri-Band Wi-Fi 7 Gaming Router EasyMesh Is Available When Wi-Fi Routers Work in AP Mode as A Controller. Archer BE550 New Software Enhances System Stability and Optimizes MLO Network Stability. TL-WA3001 Supports EasyMesh, Speed Limit, Guest Network in AP Mode and/or Multi-SSID Mode.
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#5
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Re:No LAN connectivity when internet is down
a week ago

  @Davka 

 

Hi, thanks for posting question here.

It is suggested to share the information about your network topology and detailed needs first.

Then we will take further confirmation.

Check Out the Latest Posts: Archer GE550 - BE9300 Tri-Band Wi-Fi 7 Gaming Router EasyMesh Is Available When Wi-Fi Routers Work in AP Mode as A Controller. Archer BE550 New Software Enhances System Stability and Optimizes MLO Network Stability. TL-WA3001 Supports EasyMesh, Speed Limit, Guest Network in AP Mode and/or Multi-SSID Mode.
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