R3 Ethernet ports stop working

[rforce99]

Hi Netduma Support,

I’m experiencing an issue with my Netduma R3 where the Ethernet ports stop working after about 1–2 days of uptime.

Here is what happens:

• The router works normally at first

• After 1–2 days, all devices connected via Ethernet lose internet access

• WiFi continues to work without any issues

• A reboot temporarily fixes the problem, but it comes back again after some time

I have already tried the following troubleshooting steps:

• Updated to the latest firmware version

• Performed a full factory reset (without restoring any backup)

• Set up the router from scratch

• Tested multiple Ethernet ports

• Tested different Ethernet cables and devices

• Disabled IPv6

• Increased the DHCP lease time to 10000

The issue still persists consistently.

From what I can tell, it seems like either a DHCP issue or a software-related problem, since a reboot always restores functionality temporarily.

Could you please advise on what might be causing this and if there is a fix or known issue?

Thanks in advance.

[Netduma Fraser]

I've given you Early Access where we've recently released a fairly large bug fix/QOL update that may help. 

https://forum.netduma.com/topic/60946-new-r3-firmware-dumaos-401147/

Upgrade to that and then if you still get the issue please get the logs when the issue next happens, before rebooting and we can take a look.

[rforce99]

Hi Fraser,

 

unfortunately it did not fix the problem. Ethernet still went out. Wifi still works. Here are the logs minutes after it happend

R3_2026-04-21T19_20_14.978Z_logs.txt

[Netduma Fraser]

What timestamp did it happen around? In Settings > DHCP > Add Rules > Select Device > Save. Do that each wired device you're noticing the disconnects/issues with. Then reboot the router from the interface, wait 4 minutes and see if it happens again please.

[rforce99]

Already added them. Around 20:18 it happend

 

[Netduma Fraser]

Thanks, could you remove your SmartBOOST priorities please and see if it continues? Other than what you've mentioned so far, what settings have you changed from their defaults?