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Category Archives for "Networking"

Heavy Strategy 008: Five Core Issues for IT Architects in 2021

I’ve just published the latest episode of Heavy Strategy with Johna Til-Johnson. In this episode we discuss five issues that we think IT Architects should be considered for 2021. The discussion on why and why not should be helpful for your own thinking and prepare you for discussions in your own organisations. You can find […]

Heavy Strategy 008: Five Core Issues for IT Architects in 2021

What five issues would be top of mind for IT architects ? Security, Backup.Recovery, Cloud, Skills Development and Distributed/Hybrid Work. Listen in on why and how these issues are our choices. If you have feedback or want us to followup then head over to our Follow Up page and send us your anonymous (or not) feedback.

The post Heavy Strategy 008: Five Core Issues for IT Architects in 2021 appeared first on Packet Pushers.

Authorize Better: Istio Traffic Policies with OPA, Styra DAS

Adam Sandor Adam is a solution architect at Styra, helping companies to adopt OPA and Styra DAS. He has been working in the cloud native space for the past six years, focusing on Kubernetes adoption and software delivery. In his free time, Adam is a dedicated DCS World pilot and happy cyclist roaming the cycle paths of the Netherlands. Cloud native tooling for authorization is an emerging trend poised to revolutionize the way we approach this oft-neglected part of our applications. Styra DAS offer. When services are connected using the Istio service mesh, all those sidecar proxies running Envoy are great places to make authorization decisions. All HTTP requests flow through them with metadata included about the source and destination services. The capabilities of Envoy are exposed by Istio in the form of the

Automatic Remediation of Kubernetes Nodes

Automatic Remediation of Kubernetes Nodes
Automatic Remediation of Kubernetes Nodes

We use Kubernetes to run many of the diverse services that help us control Cloudflare’s edge. We have five geographically diverse clusters, with hundreds of nodes in our largest cluster. These clusters are self-managed on bare-metal machines which gives us a good amount of power and flexibility in the software and integrations with Kubernetes. However, it also means we don’t have a cloud provider to rely on for virtualizing or managing the nodes. This distinction becomes even more prominent when considering all the different reasons that nodes degrade. With self-managed bare-metal machines, the list of reasons that cause a node to become unhealthy include:

  • Hardware failures
  • Kernel-level software failures
  • Kubernetes cluster-level software failures
  • Degraded network communication
  • Software updates are required
  • Resource exhaustion1
Automatic Remediation of Kubernetes Nodes

Unhappy Nodes

We have plenty of examples of failures in the aforementioned categories, but one example has been particularly tedious to deal with. It starts with the following log line from the kernel:

unregister_netdevice: waiting for lo to become free. Usage count = 1

The issue is further observed with the number of network interfaces on the node owned by the Container Network Interface (CNI) plugin getting out of proportion with the number of running pods:

$  Continue reading

Hedge 91: Leslie Daigle and IP Addresses Acting Badly

What if you could connect a lot of devices to the Internet—without any kind of firewall or other protection—and observe attackers trying to find their way “in?” What might you learn from such an exercise? One thing you might learn is a lot of attacks seem to originate from within a relatively small group of IP addresses—IP addresses acing badly. Listen in as Leslie Daigle of Thinking Cat and the Techsequences podcast, Tom Ammon, and Russ White discuss just such an experiment and its results.

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Day Two Cloud 106: Towards A More Open Cloud

On today's Day Two Cloud we discuss the notion of open cloud. The premise is about reducing or minimizing costs of migrating from a public cloud. In theory, open cloud lets organizations keep their options open to make changes and reduces lock-in. But is open cloud even feasible? Our guest is Chris Psaltis, co-founder and CEO of Mist.io, a startup building an open-source, multi-cloud management platform.

The post Day Two Cloud 106: Towards A More Open Cloud appeared first on Packet Pushers.

Day Two Cloud 106: Towards A More Open Cloud

On today's Day Two Cloud we discuss the notion of open cloud. The premise is about reducing or minimizing costs of migrating from a public cloud. In theory, open cloud lets organizations keep their options open to make changes and reduces lock-in. But is open cloud even feasible? Our guest is Chris Psaltis, co-founder and CEO of Mist.io, a startup building an open-source, multi-cloud management platform.

Free Speech is More than Words

A couple of weeks ago, I joined Leslie Daigle and Alexa Reid on Techsequences to talk about free speech and the physical platform—does the right to free speech include the right to build and operate physical facilities like printing presses and web hosting? I argue it does. Listen in if you want to hear my argument, and how this relates to situations such as the “takedown” of Parler.

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NATs, PATs, and Network Hygiene

While reading a research paper on address spoofing from 2019, I ran into this on NAT (really PAT) failures—

In the first failure mode, the NAT simply forwards the packets with the spoofed source address (the victim) intact … In the second failure mode, the NAT rewrites the source address to the NAT’s publicly routable address, and forwards the packet to the amplifier. When the server replies, the NAT system does the inverse translation of the source address, expecting to deliver the packet to an internal system. However, because the mapping is between two routable addresses external to the NAT, the packet is routed by the NAT towards the victim.

The authors state 49% of the NATs they discovered in their investigation of spoofed addresses fail in one of these two ways. From what I remember way back when the first NAT/PAT device (the PIX) was deployed in the real world (I worked in TAC at the time), there was a lot of discussion about what a firewall should do with packets sourced from addresses not indicated anywhere.

If I have an access list including 192.168.1.0/24, and I get a packet sourced from 192.168.2.24, Continue reading

Heavy Networking 588: Exploring The Hidden Realms Of Subsea Cables With Telstra (Sponsored)

Subsea communications cables are an essential part of the global Internet. On today's Heavy Networking, sponsored by Telstra, we dive into the realms of undersea cables to learn how they are laid, signalling methods, POPs and landing stations, how they can be damaged (and repaired), and more. Our Telstra guests are Andy Lumsden, Head of Network Engineering and Operations; and Jeff McHardy, General Manager, Network Development and Commercial Management.

Heavy Networking 588: Exploring The Hidden Realms Of Subsea Cables With Telstra (Sponsored)

Subsea communications cables are an essential part of the global Internet. On today's Heavy Networking, sponsored by Telstra, we dive into the realms of undersea cables to learn how they are laid, signalling methods, POPs and landing stations, how they can be damaged (and repaired), and more. Our Telstra guests are Andy Lumsden, Head of Network Engineering and Operations; and Jeff McHardy, General Manager, Network Development and Commercial Management.

The post Heavy Networking 588: Exploring The Hidden Realms Of Subsea Cables With Telstra (Sponsored) appeared first on Packet Pushers.

The Data Driven Enterprise

The Data Driven Enterprise

The rise of cloud migration for enterprises with mission critical applications is redefining the data center. The reality for any enterprise: a systematic approach balancing workloads in the cloud and premises while securing data. Data and applications must be managed as critical assets in the 21st century.

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