Recurrent internet drops at 10:00

[Smasher85]

Hi,

I´m facing a strange recurring issue where my internet connection drops almost every day at 10:00 and comes back at around 10:30. A restart of the router always solves it instantly. Both Wifi and LAN is effected but sometimes some computers works.

This is my setup :

• Internet though fiber modem
• Asus GT-AX6000 router
  - Assigned DNS from ISP but have also tried static (1.1.1.1/8.8.8.8)
  - DHCP
  - One static IP for the NAS
  - 2.4 and 5 GHz Wifi with WPA2-Personal security
  - Latest firmware with no other settings change from default
• About 20 connected devices, most Wifi (small devices like smart plugs and so on) but also some though cable like computers, consoles and Nvidia Shields.
• No Mesh
• 3 Netgear ProSafe GS108
• 1 Netgear GS116E switch connecting computers and switches to the router.

Details
When the problem occurs, I can search on google.com and get results, but when I click a link, I get no response. The same happens if I enter the URL (IP or name) manually. I can still use Facebook Messenger, but Spotify will not start.

The router is accessible and shows that it has internet. LAN and Wi-Fi work as they should, but internet is crippled. I have tried troubleshooting this during the outage but have not found the cause yet:

• The router can ping its gateway (0.179 ms), and this gateway can also be pinged from my workstation (Windows).
• The router can ping the DNS provided by my ISP.
• The router can ping 8.8.8.8 and 1.1.1.1 with an average delay of ~14.5 ms.
• The router can run nslookup against google.com using the ISP’s DNS, and it also works with other domains (even those that fail to load when accessed from my phone via Wi-Fi or my workstation).
• I have tried setting static DNS (8.8.8.8 and 1.1.1.1) in the router, but it doesn’t help. Devices, including the workstation, always use the router DNS, which then forwards to either the static or ISP-provided DNS.
• Router system log shows no problems.
• The router has been factory reset, and I have also tried Merlin firmware with the same result.

I have had this problem a long time now and made several attempts to find a solution.

One thing that always works is restarting the router, this solves the problem instantly. Restarting devices alone does nothing.

The router is almost 3 years old.

I can send the router in for warranty, but the problem is not consistent, so the store might not be able to reproduce it.

Any suggestions?

 

[ColinTaylor]

Strange indeed. You said that nslookup works from the router. What about if you try it from your workstation directly to a public DNS server, e.g.

nslookup google.com 8.8.8.8

 

[Smasher85]

The nslookup give the following result from the Windows 11 computer during the outage :

> 192.168.50.1
Server : GT-AX6000-73B0
Address : 192.168.50.1

Name : GT-AX6000-73B0
Address : 192.168.50.1

> google.com
Server: GT-AX6000-73B0
Address : 192.168.50.1

Non-authoritative answer:
Name : google.com
Addresses: 2a00:1450:400f:80d::200e 216.58.207.238

I was also able to ping both the ISP gateway and their DNS from the Windows computer with successful replies.

 

[ColinTaylor]

Sounds like it might be an ISP issue. Is this a new problem or a continuation of the problem you had with your previous router?

 

[Tech9]

- One static IP for the NAS

Is there anything running on schedule? Like large volume of data backup to the NAS? To me it sounds like Internet is working, but you have severe LAN congestion at this time of the day.

What are all the switches with total of 40x LAN ports for if you have around 20 clients only and most of them are connected over Wi-Fi? Any specific Ethernet connected device turning on around this time of the day? Check for connection loops.

 

[bbunge]

You say your NAS has a static IP address. Is it really a static IP address assigned at the NAS or a manually reserved address set at the router? If it is assigned at the NAS have you set the router DHCP start or end range to exclude the NAS IP address so the DHCP does not try to assign that address to another device?
The router DHCP renewal is, by default, set to 86400 seconds which is one day. Your problem happens every day at the same time and you reboot the router at the same time? I believe the DHCP is to try the renewal at 1/2 the set renewal time but... Just grasping at your regular daily problem...