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Widespread outage 20-02-23

Barnet

ULTIMATE Member
There seems to have been some sort of widespread outage this morning on Community Fibre.

Nicely summed up by this extract of a post on Twitter:

"Fibre internet is down in our locality IG5, this morning at 7.30am. Downdetector showing a spike of 700+ reports this morning too. ONT and router connections checked and rebooted."

It was fixed after about an hour for me.

A change in the public IP address (via CG NAT) but the same 100.70.xxx.xxx address.

It seemed like DHCP on CommunityFibre's network had failed but that might have been a symptom rather than the cause.

All lights were green on the ONT and I could see my router trying to communicate with the ONT (flashing interface light) but the router (which uses ARP as the test of the network being up) saw Community Fibre as "down".

As the first thing I did was power cycle the ONT then the router any saved configuration would have been lost and this may have contributed to what I observed.

I was using my phone on WiFi when the connection dropped and (unsurprisingly) that said "no internet connection".

I tried a few pings before power cycling and I couldn't get anywhere beyond my LAN via Community Fibre.

Now sorted but not ideal.

I also now can't track down Community Fibre's service status page.
 
Last edited:
@meritez

I don't use Community Fibre's DNS (I use OpenDNS on my router) so I couldn't tell that but pinging (say) 8.8.8.8 got nowhere during the outage so I don't think it was a simple as an ISP DNS problem.

Everything at a physical level seemed OK and given the widespread nature of the outage I guess it was something in the Community Fibre core network.
 
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@stackdell

Now that's a very interesting piece of information.

Perhaps the fault today was a repeat of whatever happened on 1st October 2022.

Thanks.
 
I’m on the 1gbps service which wasn’t effected.

I avoided the CGNAT services below 500mbps as it adds more complexity.
Same here, SE9 no downtime.

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@meritez

I don't use Community Fibre's DNS (I use OpenDNS on my router) so I couldn't tell that but pinging (say) 8.8.8.8 got nowhere during the outage so I don't think it was a simple as an ISP DNS problem.

Everything at a physical level seemed OK and given the widespread nature of the outage I guess it was something in the Community Fibre core network.
Do a trace route to that DNS and keep it. Then when the service is down you can do another trace route and see how far your traffic is getting to understand where is the issue.
 
@GreenLantern22

I tried that and didn't get beyond my LAN.

This may be because I went for power cycling a bit early in my fault finding, but during the previous fault I could do exactly as you suggest and identify the IP address where it got stuck.

Today may have been a bit different to the previous fault but both only seemed to impact users with the lower speed packages and thus CG NAT.
 
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