No LAN connectivity when internet is down
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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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!
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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.
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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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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!
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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.
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Thanks a bunch to the support engineers for helping with solving the problem. You guys are awesome. Very appreciated the help.
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