It’s incredibly difficult from afar to make sense of the almost 800 papers published at ICML this year! In practical terms I was reduced to looking at papers highlighted by others (e.g. via best paper awards), and scanning the list of paper titles looking for potentially interesting topics. For the next few days we’ll be looking at some of the papers that caught my eye during this process.
The now somewhat tired phrase “data is the new oil” (something we can consume in great quantities to eventually destroy the world as we know it???) suggests that data has value. But pinning down that value can be tricky – how much is a given data point worth, and what framework can we use for thinking about that question?
As data becomes the fuel driving technological and economic growth, a fundamental challenge is how to quantify the value of data in algorithmic predictions and decisions…. In this work we develop a principled framework to address data valuation in the context of supervised machine learning.
One of the nice outcomes is that once you’ve understood Continue reading
As enterprisesincreasingly focus on improving network performance to support applications and deliver a better customer experience, SD-WAN solutions are in the spotlight. One of the key components of providing ongoing IT support is ensuring that networks have the agility needed to adapt to changing business priorities at speed.In one recent IDG survey, 91% of enterprises that implemented SD-WAN technologies saw an increase in network speed. SD-WAN managed services have come to the forefront as a choice that allows enterprises to capture the benefits of SD-WAN, along with the expertise to make the most of the technology. Solutions offer access to the knowledge needed to design, deploy and manage SD-WAN networks, while letting the enterprise maintain visibility and control as desired.To read this article in full, please click here
The video of a talk by Peter Lundqvist from DKNOG9 describes BGP FlowSpec, use cases, and details of Arista's implementation.
FlowSpec for real-time control and sFlow telemetry for real-time visibility is a powerful combination that can be used to automate DDoS mitigation and traffic engineering. The article, Real-time DDoS mitigation using sFlow and BGP FlowSpec, gives an example using the sFlow-RT analytics software.
EOS 4.22 includes support for BGP FlowSpec. This article uses a virtual machine running vEOS-4.22 to demonstrate how to configure FlowSpec and sFlow so that the switch can be controlled by an sFlow-RT application (such as the DDoS mitigation application referenced earlier).
The following output shows the EOS configuration statements related to sFlow and FlowSpec:
Without the right kind and the right amount of I/O between the components of a system, all of the impressive feeds and speeds of the individual components don’t amount to more than a pile of silicon and sheet metal. …
The Packet Pushers are relaunching our Ignition membership site with a premium-only model and a brand new course on practical QoS from Ethan Banks. On today's show we cover the details of the relaunch and share a sneak peek of the course.
Almost nine years ago, Cloudflare was a tiny company and I was a customer not an employee. Cloudflare had launched a month earlier and one day alerting told me that my little site, jgc.org, didn’t seem to have working DNS any more. Cloudflare had pushed out a change to its use of Protocol Buffers and it had broken DNS.
I wrote to Matthew Prince directly with an email titled “Where’s my dns?” and he replied with a long, detailed, technical response (you can read the full email exchange here) to which I replied:
From: John Graham-Cumming
Date: Thu, Oct 7, 2010 at 9:14 AM
Subject: Re: Where's my dns?
To: Matthew Prince
Awesome report, thanks. I'll make sure to call you if there's a
problem. At some point it would probably be good to write this up as
a blog post when you have all the technical details because I think
people really appreciate openness and honesty about these things.
Especially if you couple it with charts showing your post launch
traffic increase.
I have pretty robust monitoring of my sites so I get an SMS when
anything fails. Monitoring shows I was down from 13:03:07 Continue reading
Vor etwa neun Jahren war Cloudflare noch ein winziges Unternehmen und ich war ein Kunde, kein Mitarbeiter. Cloudflare gab es erst seit einem Monat. Eines Tages wurde ich darüber benachrichtigt, dass bei meiner kleinen Website jgc.org der DNS-Service nicht mehr funktionierte. Cloudflare hat seine Verwendung von Protocol Buffers angepasst und dadurch wurde der DNS-Service unterbrochen.
Ich habe eine E-Mail mit dem Titel „Where‘s my dns?“ (Wo ist mein DNS) direkt an Matthew Prince gesendet und er hat mit einer langen, detaillierten, technischen Erklärung reagiert (Sie können den vollständigen E-Mail-Austausch hier lesen), auf die ich antwortete:
Von: John Graham-Cumming
Datum: Do., 7. Okt. 2010 um 09:14
Betreff: Re: Wo ist mein DNS?
An: Matthew Prince
Toller Bericht, danke. Ich werde auf jeden Fall anrufen, wenn es ein
Problem geben sollte. Es wäre wahrscheinlich sinnvoll, all das in
einem Blog-Beitrag festzuhalten, wenn Sie alle technischen Details haben. Ich glaube nämlich,
dass es Kunden wirklich zu schätzen wissen, wenn mit solchen Dingen offen und ehrlich umgegangen wird.
Sie könnten auch die Traffic-Zunahme nach der Implementierung mit
Diagrammen veranschaulichen.
Ich habe eine recht zuverlässige Überwachung für meine Websites eingerichtet, deshalb bekomme ich eine SMS, wenn
etwas ausfällt. Meine Daten zeigen, Continue reading
CPU 耗尽是由一个 WAF 规则引起的，该规则里包含不严谨的正则表达式，最终导致了过多的回溯。作为中断核心诱因的正则表达式是 (?:(?:\"|'|\]|\}|\\|\d|(?:nan|infinity|true|false|null|undefined|symbol|math)|\`|\-|\+)+[)]*;?((?:\s|-|~|!|{}|\|\||\+)*.*(?:.*=.*)))
Il y a près de neuf ans, Cloudflare était une toute petite entreprise dont j’étais le client, et non l’employé. Cloudflare était sorti depuis un mois et un jour, une notification m’alerte que mon petit site, jgc.org, semblait ne plus disposer d’un DNS fonctionnel. Cloudflare avait effectué une modification dans l’utilisation de Protocol Buffers qui avait endommagé le DNS.
J’ai contacté directement Matthew Prince avec un e-mail intitulé « Où est mon DNS ? » et il m’a envoyé une longue réponse technique et détaillée (vous pouvez lire tous nos échanges d’e-mails ici) à laquelle j’ai répondu :
De: John Graham-Cumming
Date: Jeudi 7 octobre 2010 à 09:14
Objet: Re: Où est mon DNS?
À: Matthew Prince
Superbe rapport, merci. Je veillerai à vous appeler s’il y a un
problème. Il serait peut-être judicieux, à un certain moment, d’écrire tout cela dans un article de blog, lorsque vous aurez tous les détails techniques, car je pense que les gens apprécient beaucoup la franchise et l’honnêteté sur ce genre de choses. Surtout si vous y ajoutez les tableaux qui montrent l’augmentation du trafic suite à votre lancement.
Je dispose d’un système robuste de surveillance de mes sites qui m’envoie un Continue reading
From: John Graham-Cumming
日時：2010/10/7（木）9:14 AM
件名：Re: 私のDNSはどうなったのでしょうか？
To: Matthew Prince
ご報告ありがとうございました。何か問題があれば
ご連絡します。 技術詳細に関する全容が判明したら、
本件をブログに記載するのはいかがでしょうか。
本件に対しての開示や誠実であることを他の人も評価すると思うのです。
特に、ローンチ後のトラフィック増加を示すグラフを
添えていただければと思います。
私は自分のサイトを厳格に監視しているので、何かあれば
SMSを受け取れます。 監視結果では13:03:07から14:04:12までダウンしていたことが
わかりました。 テストは5分おきに実行されています。
本件は大事には至らずに済んでいますし、解決していただけると確信しています。 しかしながら、ヨーロッパには本当に
誰も必要ないとお考えですか？
これに対するMatthewの返信は以下の通りです。
From: Matthew Prince
日時：2010/10/7（木）9:57 AM
件名：Re: 私のDNSはどうなったのでしょうか？
To: John Graham-Cumming
ありがとうございます。Cloudflareではいただいたメールすべてに対して返信しております。私は現在
オフィスに向かっており、ブログへの投稿またはCloudflareの掲示板システムのトップに
公式投稿をピン留めする予定です。透明性が一番だということには
全面的に同意します。
3分後、1つ目のPagerDutyページがWAFの異常を表示して停止しました。これはCloudflare外からWAFの機能を確認する模擬テストで（このようなテストは数百とあります）、正常動作を確認するためのものでした。そしてすぐにCloudflareサービスのエンドツーエンドテストの失敗、グローバルなトラフィック低下アラート、502エラーの蔓延がページに表示され、世界各都市のPoint of Presence（PoP）からCPU枯渇に関する報告を多数受けました。
上記の変更申請でご確認いただける通り、リリース計画、ロールバック計画、この種のリリース向けの内部標準業務手順書（SOP）へのリンクが記載されています。そして、ルール変更向けのSOPでは特別にグローバルなプッシュが許可されています。これはCloudflareでリリースする他のソフトウェアとは大きく異なるものです。通常SOPのプッシュ先はまず内部の試験運用版ネットワークにあるPoit of Presence（PoP）、次に独立した地域にいる少数のお客様、多数のお客様、最後に世界という順になります。
When we talk about VPNv4 prefixes – Route Distinguishers (RDs) play an incredibly important role in ensuring multipath routing. We talked about this a little bit in our last post, but I want to hit it home in this post as well as cover a couple of other items in a little great detail.
To start with, we’re going to use our same physical lab topology, but changes things up slightly. Namely….
vMX7 will remain a BGP route reflector but will also now participate in the dataplane by having it’s interfaces enabled with LDP and MPLS
vMX1 and vMX3 will act as remote PEs for our provider that are hosting an anycast service. Both will be advertising 140.10.20.0/24 into a “Provider” VPN which we will then import into our customer VPN.
vMX2 will now act like a Customer Edge (CE) router peering to vMX5 which will act as the provider edge (PE) router. It will peer with the provider in AS65000 from AS12345.
So our diagram will now look something like this…
Alright. So for the sake of thoroughness, I’ll start by including our base configurations again since they did change ever so slightly, and I Continue reading
In a culture of Internet toxicity, a question all productivity-minded people should ponder is why they are participating in social platforms. For example, Twitter has become a predominantly negative cesspool. Even the pun-loving techies I monitor from a distance seem to lean increasingly toward darkness and anger.
Few rainbows are to be found on Twitter these days. Maybe it’s just the dark mode UI talking, but I don’t go there to laugh anymore. I don’t go there to connect with friends. Instead, I put on my virtual armor, and read through comments and responses directed at me or my company. To be sure, much of what I see is fine. However, many comments are meant to start fires, even when couched in smiling niceties.
That’s the Internet for you. We’ve always had flame wars, trolls, and haters, all the way back to my dial-up days on Delphi forums and AOL. I know how to block and mute people, and of course that helps. Even so, I find that there’s something different in the tone these days. Folks are on crusades to bring others down. To shame. To burn in digital effigy.
You’re probably familiar with Cisco DevNet. If not, DevNet is the place Cisco has embraced outreach to the developer community building for software-defined networking (SDN). Though initially cautious in getting into the software developer community, Cisco has embraced their new role and really opened up to help networking professionals embrace the new software normal in networking. But where is DevNet going to go from here?
Humble Beginnings
DevNet wasn’t always the darling of Cisco’s offerings. I can remember sitting in on some of the first discussions around Cisco OnePK and thinking to myself, “This is never going to work.”
My hesitation with Cisco’s first attempts to focus on software platforms came from two places. The first was what I saw as Cisco trying to figure out how to extend the platforms to include some programmability. It was more about saying they could do software and less about making that software easy to use or program against. The second place was actually the lack of a place to store all of this software knowledge. Programmers and developers are fickle lot and you have to have a repository where they can get access to the pieces they needed.
According to a recent survey conducted by Consumers International and the Internet Society, 63% of consumers think the way Internet-connected devices collect data is “creepy.” The Trust Opportunity: Exploring Consumer Attitudes to the Internet of Things, which polled people in the US, Canada, Japan, Australia, France, and the UK, also found that 73% of consumers think people using connected devices should worry about eavesdropping. And yet, new connected devices are being introduced practically every day, and sales show no sign of slowing down.
The word “smart” is used to describe almost all of these devices. But is that right?
The marketing around the Internet of Things (IoT) has become almost non-stop. Smart-this will make your life better, happier, more efficient. If only you had smart-that, you would reap the benefits of the marvelous technological age in which we live. But this often leaves out key information consumers need to make real smart choices.
It’s really about connectivity. For instance, that smart oven is a
computer that happens to get hot in the middle. These IoT devices are able to
perform smart functions because they are connected to the Internet. And while
the marketing focuses on features and functionality, Continue reading
