bgp – Noise

BGP zombies and excessive path hunting

Bryton Herdes — Fri, 31 Oct 2025 15:30:00 +0000

A BGP “zombie” is essentially a fancy name for a route that has become stuck in the Default-Free Zone (DFZ) of the Internet, potentially due to a missed or lost prefix withdrawal. In this post, we will walk through some situations where BGP zombies are more likely to rise from the dead and wreak havoc, how excessive path hunting can contribute to longer periods of impact, and some recommendations and follow-ups we have to put together to make them less likely.

Monitoring AS-SETs and why they matter

Mingwei Zhang — Fri, 26 Sep 2025 14:00:00 +0000

We will cover some of the reasons why operators need to monitor the AS-SET memberships for their ASN, and now Cloudflare Radar can help.

Bringing connections into view: real-time BGP route visibility on Cloudflare Radar

Mingwei Zhang — Wed, 21 May 2025 13:00:00 +0000

Real-time BGP route visualization is now available on Cloudflare Radar, providing immediate insights into global Internet routing.

The backbone behind Cloudflare’s Connectivity Cloud

Shozo Moritz Takaya — Tue, 06 Aug 2024 13:00:22 +0000

Read through the latest milestones and expansions of Cloudflare's global backbone and how it supports our Connectivity Cloud and our services

Exam-ining recent Internet shutdowns in Syria, Iraq, and Algeria

David Belson — Fri, 21 Jun 2024 13:00:02 +0000

Similar to actions taken over the last several years, governments in Syria, Iraq, and Algeria have again disrupted Internet connectivity nationwide in an attempt to prevent cheating on exams. We investigate how these disruptions were implemented, and their impact

Traffic anomalies and notifications with Cloudflare Radar

David Belson — Tue, 26 Sep 2023 13:00:37 +0000

Cloudflare Radar now displays country and ASN traffic anomalies in the Outage Center as they are detected, as well as publishing anomaly information via API. We are also launching Radar notifications, enabling users to subscribe to notifications about traffic anomalies

Cloudflare Radar’s new BGP origin hijack detection system

Mingwei Zhang — Fri, 28 Jul 2023 13:00:26 +0000

BGP origin hijacks allow attackers to intercept, monitor, redirect, or drop traffic destined for the victim's networks. We explain how Cloudflare built its BGP hijack detection system, from its design and implementation to its integration on Cloudflare Radar

Helping build a safer Internet by measuring BGP RPKI Route Origin Validation

Carlos Rodrigues — Fri, 16 Dec 2022 14:00:00 +0000

Is BGP safe yet? If the question needs asking, then it isn't. But how far the Internet is from this goal is what we set out to answer.

Why BGP communities are better than AS-path prepends

Tom Strickx — Thu, 24 Nov 2022 17:31:47 +0000

Routing on the Internet follows a few basic principles. Unfortunately not everything on the Internet is created equal, and prepending can do more harm than good. In this blog post we’ll talk about the problems that prepending aims to solve, and some alternative solutions

How we detect route leaks and our new Cloudflare Radar route leak service

Mingwei Zhang — Wed, 23 Nov 2022 16:00:00 +0000

In this blog post, we will introduce our new system designed to detect route leaks and its integration on Cloudflare Radar and its public API.

Route leaks and confirmation biases

Maximilian Wilhelm — Wed, 23 Feb 2022 13:59:26 +0000

On February 1, 2022, a configuration error on one of our routers caused a route leak of up to 2,000 Internet prefixes to one of our Internet transit providers. This leak lasted for 32 seconds and at a later time 7 seconds

What happened on the Internet during the Facebook outage

Celso Martinho — Fri, 08 Oct 2021 15:16:00 +0000

Today, we're going to show you how the Facebook and affiliate sites downtime affected us, and what we can see in our data.

Hypotheses About What Happened to Facebook

Bozho — Wed, 06 Oct 2021 08:06:03 +0000

Facebook was down. I’d recommend reading Cloudflare’s summary. Then I recommend reading Facebook’s own account on the incident. But let me expand on that. Facebook published announcements and withdrawals forContinue reading

The post Hypotheses About What Happened to Facebook appeared first on Bozho's tech blog.

Understanding How Facebook Disappeared from the Internet

Tom Strickx — Mon, 04 Oct 2021 21:08:52 +0000

Today at 1651 UTC, we opened an internal incident entitled "Facebook DNS lookup returning SERVFAIL" because we were worried that something was wrong with our DNS resolver 1.1.1.1. But as we were about to post on our public status page we realized something else more serious was going on.

Fall 2020 RPKI Update

Louis Poinsignon — Fri, 06 Nov 2020 12:36:07 +0000

The cap of two hundred thousand routing cryptographic records was recently passed. We thought it was time for an update on a major year for RPKI.