Issues connecting to Cloudflare over IPv4 in Nashville

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1

A client reported issues connecting to various websites this evening
and I've narrowed it down to cloudflare hosted sites specifically on
ipv4. My traceroutes go through my upstream all the way to Comcast in
Nashville where they die.

IPv6 cloudflare addresses work just fine, but several v4 addresses I
tested fail.

Is anybody else seeing similar issues, or anybody from cloudflare here
able to help me troubleshoot?

Thanks!
Landy

2

Do you have some example trace routes?

-mel

3

I don’t have them handy on my phone, but luckily the issue had resolved itself by the time I got up Saturday morning, so no need to dig further.

4

We saw similar a few months ago over a period with our customers transiting Chicago through Lumen. We found a Cloudflare maintenance was going on at the time, but it seems something went wrong between them and Lumen. We could not ping Cloudflare DNS such as 1.1.1.1 or reach other Cloudflare sites over that period. We had to disable our Lumen link through Chicago to recover. We never established whose fault it was.

-Ian

5

We (Cloudflare) had a 15mins connectivity incident in Chicago on 2024-11-12, maybe that’s the one you’re referring to.

6

Thank you for your reply and the information.

The event we experienced lasted several hours on September 5, 2024, and coincided with this maintenance: https://community.cloudflare.com/t/ord-chicago-on-2024-09-05/707550.

Ultimately, we had to take down our Lumen connection through Chicago to restore customers’ ability to access Cloudflare-related sites and services.

Here is an article we found about someone experiencing a similar issue shortly after ours: https://www.bleepingcomputer.com/news/technology/cloudflare-outage-cuts-off-access-to-websites-in-some-regions/.

Interestingly, this article mentions Nashville, similar to the original discussion.

We are unsure if our event was due to Lumen failing to reroute traffic correctly during Cloudflare’s maintenance or another underlying issue. A ticket was opened with Lumen, and they confirmed seeing link state changes with Cloudflare, but they were unable to provide details regarding the associated routing. It was difficult to reach Cloudflare during or after the event to obtain information.

Thank you,
-Ian