Ages ago when we were building networks using super-expensive 64kbps WAN links, a customer sent us a weird bug report:
Everything works fine, but we cannot transfer one particular file between two locations – the file transfer stalls and eventually times out. At the same time, we’re seeing increased number of CRC errors on the WAN link.
My chat with the engineer handling the ticket went along these lines:
Ages ago when we were building networks using super-expensive 64kbps WAN links, a customer sent us a weird bug report:
Everything works fine, but we cannot transfer one particular file between two locations – the file transfer stalls and eventually times out. At the same time, we’re seeing increased number of CRC errors on the WAN link.
My chat with the engineer handling the ticket went along these lines:
Device Insights, a feature of Cisco's SecureX XDR service, aggregates, normalizes, and visualizes esssential details about all the devices on your network. SecureX can also automate workflows to respond to device-level security problems.
The post An Overview Of Cisco’s SecureX Device Insights appeared first on Packet Pushers.
Back in early July, we covered the launch of IBM’s entry and midrange Power10 systems and mused about how Big Blue could use these systems to reinvigorate an HPC business rather than just satisfy the needs of the enterprise customers who run transaction processing systems and are looking to add AI inference to their applications through matrix math units on the Power10 chip. …
IBM Uses Power10 CPU As An I/O Switch was written by Timothy Prickett Morgan at The Next Platform.
A couple of days ago, I was checking my Twitter feed and saw a tweet from someone saying how frustrated he was that DockerHub (a renowned container registry) was down. Someone else replied to the tweet, recommending the tweet’s author to check out Google’s repository, where they have DockerHub mirrors in Google Cloud.
My first reaction was “Nice! How clever of this person (or Google) to have thought of this idea.” My next thought was, wait. This could lead to potential security risks for some developers who are not familiar with how these registries are updated and what images go into these mirrored sites. Imagine when application developers are busy scrambling to check-in their latest update to the CI/CD pipeline of the software they are building, and in that time crunch, their go-to container registry is down. Do developers really have the time to check if there are vulnerable images in every registry they use? Will there be an easy, streamlined way to automatically scan the images no matter which registry developers use to pull their images? The short answer is yes, and we will look into that in this blog.
Today's Full Stack Journey podcast is all about Pixie, an "open source observability tool for Kubernetes applications." Pixie takes advantage of eBPF to capture telemetry data. Joining Scott to provide a beginner-level overview of Pixie is Fabian Ngala.
The post Full Stack Journey 068: An Introduction To Pixie For Open-Source Kubernetes Observability appeared first on Packet Pushers.
LiveAction provides network and application monitoring that integrates flow records and packets. This integration gives network management teams a clear, clean view of network topology and applications traffic–even for the most complex, multi-vendor networks. LiveAction can also capture and analyze packets to help engineers troubleshoot problems and investigate incidents.
The post LiveAction Unifies Flow, Packets For Deep Network Visibility appeared first on Packet Pushers.
Over the years I've been lurking around the Linux kernel and have investigated the TCP code many times. But when recently we were working on Optimizing TCP for high WAN throughput while preserving low latency, I realized I have gaps in my knowledge about how Linux manages TCP receive buffers and windows. As I dug deeper I found the subject complex and certainly non-obvious.
In this blog post I'll share my journey deep into the Linux networking stack, trying to understand the memory and window management of the receiving side of a TCP connection. Specifically, looking for answers to seemingly trivial questions:
Our exploration focuses on the receiving side of the TCP connection. We'll try to understand how to tune it for the best speed, without wasting precious memory.
To best illustrate the receive side buffer management we need pretty charts! But to grasp all the numbers, we need a bit of theory.
We'll draw charts from a receive side of a TCP flow, Continue reading
This lesson covers the concept of idempotency and why it’s essential to Ansible. You can find the full playlist with all 8 videos on the Packet Pushers’ YouTube channel. You can subscribe to the Packet Pushers’ YouTube channel for more videos as they are published. It’s a diverse a mix of content from Ethan and […]
The post Ansible For Network Automation Lesson 8: Ansible And Idempotency – Video appeared first on Packet Pushers.
Today on the Tech Bytes podcast we welcome back sponsor Nokia to talk about a compelling feature in Nokia’s Fabric Services System. This feature, called Connect, lets Fabric Services System integrate with platforms such as VMware, OpenStack, and Kubernetes to streamline the provisioning of network services in Top Of Rack switches when new workloads or services are instantiated.
The post Tech Bytes: Nokia Fabric Services System Streamlines Network Automation For Application Stacks (Sponsored) appeared first on Packet Pushers.
It has been almost two years since infrastructure software maker Progress Software spent $220 million to buy Chef, the open source automation tech vendor Chef that was helping to fuel the “infrastructure as code” trend. …
Making Progress With Infrastructure As Code was written by Jeffrey Burt at The Next Platform.