Hi @Clive_A 

 

Thanks for your response!

This issue affects all Mac devices, both on LAN and WiFi, while Windows and mobile devices remain unaffected. It only started happening after switching to the ER8411. During the first week, everything was fine, but the problem began after that.
 

I also tried running nslookup google.com, and here’s the result:

Server:  8.8.8.8  
Address:  8.8.8.8#53  
 

Non-authoritative answer:  
Name: google.com  
Address: 142.251.220.238  

Since nslookup resolves correctly, it seems that DNS is working at some level. However, Mac devices still can’t load websites until I restart the router. Any further suggestions would be appreciated.

  Hi @Clive_A 

I’ve tested a lot of things while the Macs were experiencing the issue. It’s definitely strange, especially since it only started happening a week after switching.
 

To answer your questions:

* All affected Macs receive valid IP addresses from the router. I’ll provide a screenshot the next time I experience the issue, probably the next morning.
* Ping 8.8.8.8 works, but ping google.com fails until I flush the DNS cache. After flushing, I can ping google.com, but websites still won’t load.
* I haven’t restarted the network adapter yet, but I’ll test this as soon as the issue happens again.

I haven’t made any configuration changes on the router since the first week, when everything was working fine. That’s why I find it odd that only macOS devices are affected, while Windows and mobile devices continue to work normally.

I’ll update with more details once I test the network adapter restart.
 

 In the meantime, I’d love to hear any other thoughts you might have!

Thanks again for your time and insights—I really appreciate the help!

  @TechRookie 

Two things I have noticed with similar issues on my 8411 (although my network is far more complex)

Mac really, REALLY dont like it if IDS/IPS is running on the ER8411.  I think its something to do with iCloud proxy service they use which if i remember right, is on by default and you have to turn it off.  Disable IDS/IPS

What and how are you setting DNS to via DHCP ?   My ER8411 seems to often just stop resolving DNS if it is set to be the DNS address, or are using DNS proxy / cache

I just set external DNS directly via dhcp to the cloudflare malware/virus filtered servers (1.1.1.2 / 1.0.0.2)

Hi  @Clive_A 

Thanks for the clarification! That makes sense. I'm still quite puzzled about why this happened, but I’ll observe if the problem comes back. Hope it doesn’t. 

  Hi @Clive_A 

I’m not using a controller, just managing the ER8411 directly via its web interface. Unfortunately, I can’t provide a backup of my configuration. However, I can share specific settings or logs if that helps.

I kinda figured out what could be the problem. In my configs, I created groups with IP addresses in different ranges that I used for bandwidth control. The two Mac devices experiencing intermittent issues had IPs in the range XXX.XXX.XXX.41 to XXX.XXX.XXX.100, while another Mac outside this range had no connection problems. To test, I changed the IP of one of the affected Macs to an address outside this range, and the connection was immediately restored. However, when I assigned an IP back within the original range but in different IP, the problem returned.

To try to fix this, I created a new group with the same range, and the intermittent connection issue was resolved. The connection has remained stable for a few days now. Thanks for the help!