DNSの障害でインターネットに大規模なダウンが発生

今回は「DNSの障害でインターネットに大規模なダウンが発生」についてご紹介します。

関連ワード （Akamai、DNS、システムダウン等） についても参考にしながら、ぜひ本記事について議論していってくださいね。

本記事は、TechCrunch様で掲載されている内容を参考にしておりますので、より詳しく内容を知りたい方は、ページ下の元記事リンクより参照ください。

米国時間7月22日、インターネットのかなり大きな部分がオフラインになった。一部の人気サイトやアプリそしてサービスがダウン、その中にはUPSやFedEx（その後回復）、Airbnb、Fidelityなどもあり、報告ではSteamやLastPass、PlayStation Networkなどもダウンタイムを経験している。

世界中のウェブサイトが被害を受け、その中にはヨーロッパのメディアアウトレットもあった。

原因はAkamaiの停止と考えられている。Akamaiは多くの企業にネットワーキングとコンテンツデリバリーサービス（CDS）を提供しているインターネットセキュリティの巨人だ。東部時間の午前11時ごろAkamaiはウェブサイトやアプリやサービスの円滑かつ安全な運用を支えるサービスであるEdge DNSの問題を報告した。

pic.twitter.com/dvCBFpim2v

— *Walter Bloomberg (@DeItaone) July 22, 2021

DNSサービスはいわばインターネットの動作原理そのもののようなサービスだが、バグの存在が知られており、悪意を持った人が容易にいたずらできる。Akamaiのような企業は自社製のDNSサービスを使っているため、顧客側に生ずる問題の一部は解決しているはずだ。しかしトラブルが起きたり停止状態になれば、同社の顧客のウェブサイトと、それらに依存しているサービスのすべてに連鎖反応が起こる。

Akamaiは「問題を積極的に調査している」と述べているが、同社の広報担当者は現状でオフラインになっているサイトやサービスの障害について、同社の停止が原因であるとは明言していない。Ciscoが2020年に買収したインターネットモニタリング企業ThousandEyesの広報担当者は、停止はAkamaiで起きたもの、と述べている。

Akamaiは問題の原因についてまだ何も言わないが、すでに回復中であるとだけいう。

「私たちはこの問題の修復を実装しました。これまでの観察結果によると、サービスは通常稼働に戻りつつあります。引き続き監視を行い、問題の完全な消滅を確認いたします」という。

話の続きのようなツイートで同社は「サイバー攻撃の結果ではない」とのこと。

インターネットの大規模なダウンが起きるのは、今回が初めてではない。2020年は同じく世界中の企業にネットワーキングサービスを提供しているCloudflareが、バグによる同様の停止を経験し、ShopifyやDiscord、Politicoなどのメジャーなサイトがロードできなくなった。11月には、Amazonのクラウドサービスが同じく問題を起こした。そのインシデント中、同社自身のステータスページをアップデートできなくなっていた。オンラインワークスペースを提供しているNotionも、2021年重症のダウンを経験し、Twitterに助けを求めた。

関連記事
・CloudflareのDNSがダウンし、多くのウェブサイトが一時接続不能に
・AWS障害にともない他社サービスもダウン
・オンラインワークスペースのNotionに一時DNS原因の障害発生
・あるセキュリティ研究者がハッカーからの略奪を防ぐためにある国の期限切れトップレベルドメインを入手した

画像クレジット：Joe Raedle/Getty Images

【原文】

A large chunk of the internet dropped offline on Thursday. Some of the most popular sites, apps and services on the internet were down, including UPS and FedEx (which have since come back online), Airbnb, Fidelity, and others are reporting Steam, LastPass, and the PlayStation Network are all experiencing downtime.

Many other websites around the world are also affected, including media outlets in Europe.

What appears to be the cause is an outage at Akamai, an internet security giant that provides networking and content delivery services to companies. At around 11 a.m. ET, Akamai reported an issue with its Edge DNS, a service that’s designed to keep websites, apps and services running smoothly and securely.

DNS services are critically important to how the internet works, but are known to have bugs and can be easily manipulated by malicious actors. Companies like Akamai have built their own DNS services that are meant to solve some of these problems for their customers. But when things go wrong or there’s an outage, it can cause a knock-on effect to all of the customer websites and services that rely on it.

Akamai said it was “actively investigating the issue,” but when reached a spokesperson would not say if its outage was the cause of the disruption to other sites and services that are currently offline. A spokesperson for ThousandEyes, an internet monitoring company bought by Cisco in 2020, attributed the outage to Akamai.

Akamai would not say what caused the issue but that it was already in recovery.

“We have implemented a fix for this issue, and based on current observations, the service is resuming normal operations. We will continue to monitor to ensure that the impact has been fully mitigated,” Akamai told TechCrunch.

In a follow-up tweet, the company said it was “not a result of a cyberattack.”

It’s not the first time we’ve seen an outage this big. Last year Cloudflare, which also provides networking services to companies around the world, had a similar outage following a bug that caused major sites to stop loading, including Shopify, Discord and Politico. In November, Amazon’s cloud service also stumbled, which prevented it from updating its own status page during the incident. Online workspace startup Notion also had a high-profile outage this year, forcing the company to turn to Twitter to ask for help.

（文：Zack Whittaker、翻訳：Hiroshi Iwatani）

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