Router suddenly loose internet

[dineshgyl]

RT AX86U PRO -

Current Version : 3006.102.6

​

Nothing in the logs but I could login to router and did a ping test it failed but the router network status showed connected to internet?

Even connecting via Ethernet/wifi - All connections failed to connect to internet.

I rebooted the router and things started working fine again but not sure what caused it and what else I can do next time to diagnose this issue further?

 

[buis]

Now I have the same thing for a while with the same model, but I can't find it

 

[bbunge]

Possible DNS failure? What upstream DNS revolvers are you using? DoT in use? DNSSEC enabled?

 

[dineshgyl]

If it was a DNS failure will internet status show connected?

 

[dave14305]

If it was a DNS failure will internet status show connected?

Not a DNS failure since you were able to resolve www.google.com to an IP, but not ping it.

 

[dineshgyl]

Yeah nice catch. I did not notice it. What can i check further next time when this happens?

 

[bbunge]

Not a DNS failure since you were able to resolve www.google.com to an IP, but not ping it.

If google.com was in the router DNS cache it would show the IP address. But not connect?

I read somewhere that Cloudflare was having issues with their anycast system. Since DNS resolvers use anycast addresses this could be the issue?

 

[dave14305]

What can i check further next time when this happens?

See if the lease of the WAN IP has expired. I can see in the original screenshot that the WAN IP starts with a "1". Is it a private IP (10.x, 192.x) or CGNAT IP (100.64.x)? Check the ISP device as well for any clues of an ISP problem.

If google.com was in the router DNS cache it would show the IP address. But not connect?

The router doesn't have a DNS cache for lookups like the one used by the Network Tools.

I read somewhere that Cloudflare was having issues with their anycast system. Since DNS resolvers use anycast addresses this could be the issue?

His WAN DNS servers are Google, so I don't think it's likely. Not impossible, but this looks like a pure IP issue to me.

 

[dineshgyl]

Wan ip was 174.1x8.xx3.xx5

After reboot its

172.x7.xx3.xx5

 

[Viktor Jaep]

Wan ip was 174.1x8.xx3.xx5

After reboot its

172.x7.xx3.xx5

Thanks for masking the second octet out of an abundance of caution... but if it falls between 172.16.x.x to 172.31.x.x, then yes, it's a private IP range.

 

[dineshgyl]

Thanks for masking the second octet out of an abundance of caution... but if it falls between 172.16.x.x to 172.31.x.x, then yes, it's a private IP range.

No it does not

 

[Cythrawl]

Then you need to rapidly tighten your internet, duh!

 

[dave14305]

Then you need to rapidly tighten your internet, duh!

What are you talking about exactly?

 

[ducky124]

Since your internet got loose, don’t panic. Just open your router and tighten the little screw that holds the internet in place. It’s usually right next to the Wi-Fi light and the “Do Not Touch” sticker.


If this continues to happen, a small drop of Loctite should permanently keep your internet from loosening up again. Just be careful not to use the red stuff, or you’ll be locked into the same ISP, password, and router firmware for the rest of your natural life.


For advanced users, a torque wrench is recommended, because over-tightening can strip the bandwidth threads and cause your download speeds to leak onto the floor. If that happens, simply sweep them back into the router and reboot.


If none of this works, contact your ISP and tell them your internet came loose. They’ll understand immediately and schedule a technician to come out, replace the screw, and still somehow blame your house wiring.

 

[degrub]

Well, that was just ducky...

 

[buis]

Yeah nice catch. I did not notice it. What can i check further next time when this happens?

Do you use ziggo?