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Category Archives for "Networking"

Responding to Readers: Questions on Microloops

Two different readers, in two different forums, asked me some excellent questions about some older posts on mircoloops. Unfortunately I didn’t take down the names or forums when I noted the questions, but you know who you are! For this discussion, use the network show below.

In this network, assume all link costs are one, and the destination is the 100::/64 Ipv6 address connected to A at the top. To review, a microloop will form in this network when the A->B link fails:

  1. B will learn about the link failure
  2. B will send an updated router LSP or LSA towards D, with the A->B link removed
  3. At about the same time, B will recalculate its best path to 100::/64, so its routing and forwarding tables now point towards D as the best path
  4. D, in the meantime, receives the updated information, runs SPF, and installs the new routing information into its forwarding table, with the new path pointing towards E

Between the third and fourth steps, B will be using D as its best path, while D is using B as its best path. Hence the microloop. The first question about microloops was—

Would BFD help prevent the microloop (or Continue reading

Squeezing the firehose: getting the most from Kafka compression

Squeezing the firehose: getting the most from Kafka compression

We at Cloudflare are long time Kafka users, first mentions of it date back to beginning of 2014 when the most recent version was 0.8.0. We use Kafka as a log to power analytics (both HTTP and DNS), DDOS mitigation, logging and metrics.

Squeezing the firehose: getting the most from Kafka compressionFirehose CC BY 2.0 image by RSLab

While the idea of unifying abstraction of the log remained the same since then (read this classic blog post from Jay Kreps if you haven't), Kafka evolved in other areas since then. One of these improved areas was compression support. Back in the old days we've tried enabling it a few times and ultimately gave up on the idea because of unresolved issues in the protocol.

Kafka compression overview

Just last year Kafka 0.11.0 came out with the new improved protocol and log format.

The naive approach to compression would be to compress messages in the log individually:

Squeezing the firehose: getting the most from Kafka compression

Edit: originally we said this is how Kafka worked before 0.11.0, but that appears to be false.

Compression algorithms work best if they have more data, so in the new log format messages (now called records) are packed back to back and compressed in Continue reading

The Week in Internet News: Working Toward a Better Internet

Fixing the Internet: Is the Internet broken? Politico’s EU site looks at the work of the Internet & Jurisdiction Policy Network, which met in Ottawa, Canada, last week to discuss how to fix problems like poor cybersecurity, inaccurate information spread on social media, and other bad behavior. The Internet Society covered the first day of the Ottawa event.

The hills are alive with the sound of broadband: Motherboard has a story about the  Los Angeles Community Broadband Project, which plans to deliver wireless broadband to parts of the city using inexpensive equipment and dish-shaped antennas on hilltops and rooftops.

AI joins the force: The Verge has a long story about a secretive AI-assisted policing effort that started in 2012 as a partnership between the New Orleans Police and Palantir Technologies, a data-mining company founded with seed money from the CIA’s venture capital firm.  The program apparently used AI technologies for predictive policing, a controversial practice used to trace suspects’ ties to other gang members, analyze social media, and predict the likelihood targeted people would commit violence or become a victim. Science Magazine also has a story examining predictive policing.

Women wary of Blockchain bros: The New York Continue reading

IDG Contributor Network: Pain relief for hospitals managing IoT performance

Nowhere is there more pain for IT staff than in the ever-morphing healthcare market where the Internet of Things (IoT) has been gaining attention and traction.The concept of IoT involves the use of electronic devices that capture or monitor data and are connected via wireless to a private or public cloud, enabling them to automatically trigger certain events. In the healthcare context, a growing set of IoT devices have been introduced to patients and medical staff in various forms. Whether wireless bedside monitors, infusion pumps, or even voice/data-based clinician communication devices, the result is means better and more efficient patient care.To read this article in full, please click here

How organizations are using Microsoft’s on-premises cloud platform

Microsoft’s on-premise Azure cloud platform, Azure Stack, has now been embedded in real-world, core business environments with early adopters validating business use cases that require secured and host environments.  Here are some of the current uses of Azure Stack that are deployed in enterprises.+RELATED: What IT pros need to know about Azure Stack After virtualization and cloud, what's left on premises? How to prevent a bad case of cloud-buyer's remorse Azure Stack in healthcare Healthcare organizations have been a prime candidate for Azure Stack as they fit the model of having large (extremely large!) sets of data and customers, and also face regulatory policies and protection aimed at securing the data being transacted.  Azure Stack fits the mold of providing healthcare organizations the cloud-scale that they wish to achieve, in a protected, managed and secured environment.To read this article in full, please click here

How organizations are using Microsoft’s on-premises cloud platform

Microsoft’s on-premise Azure cloud platform, Azure Stack, has now been embedded in real-world, core business environments with early adopters validating business use cases that require secured and host environments.  Here are some of the current uses of Azure Stack that are deployed in enterprises.+RELATED: What IT pros need to know about Azure Stack After virtualization and cloud, what's left on premises? How to prevent a bad case of cloud-buyer's remorse Azure Stack in healthcare Healthcare organizations have been a prime candidate for Azure Stack as they fit the model of having large (extremely large!) sets of data and customers, and also face regulatory policies and protection aimed at securing the data being transacted.  Azure Stack fits the mold of providing healthcare organizations the cloud-scale that they wish to achieve, in a protected, managed and secured environment.To read this article in full, please click here

Hybrid cloud: How organizations are using Microsoft’s on-premises cloud platform

Microsoft’s on-premise Azure cloud platform, Azure Stack, has now been embedded in real-world, core business environments with early adopters validating business use cases that require secured and host environments.  Here are some of the current uses of Azure Stack that are deployed in enterprises.To read this article in full, please click here(Insider Story)

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