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Category Archives for "Networking"

There’s more to more than meets the eye

The Linux more command is a fairly obvious command to use when you want to scan through a text file a screen at a time, but there still might be quite a few things you don’t know about this command. For one thing, you don’t have to start at the top of the file if you don’t want to. Add an argument like +20 and you will start with the 20th line in the file with a command like that shown below.$ man +20 myfile Note that the more command automatically adjusts itself to the number of lines in your terminal window. In addition, the last line displayed will not be a line from the file by default, but an indication of what percentage of the text has been displayed thus far – at least if there’s more text to follow. It will look like this:To read this article in full, please click here

There’s more to more than meets the eye

The Linux more command is a fairly obvious command to use when you want to scan through a text file a screen at a time, but there still might be quite a few things you don’t know about this command. For one thing, you don’t have to start at the top of the file if you don’t want to. Add an argument like +20 and you will start with the 20th line in the file with a command like that shown below.$ man +20 myfile Note that the more command automatically adjusts itself to the number of lines in your terminal window. In addition, the last line displayed will not be a line from the file by default, but an indication of what percentage of the text has been displayed thus far – at least if there’s more text to follow. It will look like this:To read this article in full, please click here

Micron launches CXL 2.0 memory expansion modules

Micron has introduced memory expansion modules that support the 2.0 generation of Compute Express Link (CXL) and come with up to 256GB of DRAM running over a PCIe x8 interface.CXL is an open interconnect standard with wide industry support that is meant to be a connection between machines allowing for the direct sharing of contents of memory. It is built on top of PCI Express for coherent memory access between a CPU and a device, such as a hardware accelerator, or a CPU and memory.PCIe is normally used in point-to-point communications, such as SSD to memory, while CXL will eventually support one-to-many communication. So far, CXL is capable of simple point-to-point communication only.To read this article in full, please click here

Micron launches CXL 2.0 memory expansion modules

Micron has introduced memory expansion modules that support the 2.0 generation of Compute Express Link (CXL) and come with up to 256GB of DRAM running over a PCIe x8 interface.CXL is an open interconnect standard with wide industry support that is meant to be a connection between machines allowing for the direct sharing of contents of memory. It is built on top of PCI Express for coherent memory access between a CPU and a device, such as a hardware accelerator, or a CPU and memory.PCIe is normally used in point-to-point communications, such as SSD to memory, while CXL will eventually support one-to-many communication. So far, CXL is capable of simple point-to-point communication only.To read this article in full, please click here

Caveats When Deploying Nexus9000v

As I’m building a VXLAN lab based on Nexus9000v, I ran into some caveats while deploying. Some things are related to ESX (vSphere) only while others apply to also other platforms.

The boot process for Nexus9000v is a bit special. It requires using a serial console to access switch prompt and from there booting the NX-OS image. There are a few steps to enable this in vCenter. For the VM that was deployed using the OVA, edit settings of the VM and go to Virtual Hardware -> Serial port 1:

Use the following settings:

  • Use Network.
  • Direction – Server.
  • Port URI – telnet://<portnumber>.

Note that when selecting a port number, it must be a port above 1024.

Next, under VM Options, go to Advanced and select Edit Configuration…

Click Add Configuration Params and add the following entry:

efi.serialconsole.enabled with a value of TRUE:

The server also needs to have firewall ports open. This is done by going to Configure -> System -> Firewall:

Make sure that VM serial port is enabled.

Then, power on the device which will boot to Loader. Boot on the image stored on bootflash:

Loader Version 5.9.3.94

loader  Continue reading

Getting Comfortable with the Command Line

More than a dozen years after the SDN brouhaha erupted, some people still haven’t got the memo on the obsolescence of CLI. For example, Julia Evans tries to make people comfortable with the command line. Has nobody told her it’s like teaching COBOL?

On a more serious note: you OUGHT TO master Linux CLI and be comfortable using CLI commands on network devices and servers. Her article has tons of useful tips and is definitely worth reading.

Getting Comfortable with the Command Line

More than a dozen years after the SDN brouhaha erupted, some people still haven’t got the memo on the obsolescence of CLI. For example, Julia Evans tries to make people comfortable with the command line. Has nobody told her it’s like teaching COBOL?

On a more serious note: you OUGHT TO master Linux CLI and be comfortable using CLI commands on network devices and servers. Her article has tons of useful tips and is definitely worth reading.

Experience Innovations in Multi-cloud Networking and Security at VMware Explore 2023

We’re thrilled to invite you to VMware Explore in Las Vegas, where we’ll be showcasing the latest innovations in multi-cloud network security and redefining perceptions of managing cloud infrastructure.

Keep reading for a sneak peek at what you’ll find at VMware Explore 2023 in the realm of multi-cloud networking and security. Below, we describe the live demos and other events you can look forward to by connecting with us at Booth #305.

 

Multi-cloud networking and security with NSX: An overview

The technologies we’ll showcase at VMware Explore are part of VMware NSX.

With NSX, you can deploy workloads automatically without opening tickets and get end-to-end visibility across private, hybrid, and multi-clouds. Moreover, NSX’s security features can help strengthen your ransomware defenses and detect and evict threats in your private, hybrid, and multi-cloud environments with strong lateral security. In fact, NSX is the industry’s only network virtualization platform with full stack L2-L7 integrated networking to connect, protect, and scale your infrastructure running across clouds.

But don’t just take our word for it. Come check out our demos by visiting us at booth #305 at VMware Explore or in our virtual booth at https://engage.vmware.com/explore2023, where we cover a wide Continue reading

To New Adventures.

First and foremost, I want to express my profound gratitude for an amazing eight years at Sauce Labs. From 2016 to now, I’m extremely proud of what we’ve accomplished. I am grateful to have had the opportunity to build not just one, but two world-class teams during my time at Sauce, working alongside many others …

Supply chain improvements, AI demand propel Cisco earnings

Networking giant Cisco’s final quarter of fiscal 2023 was a surprising success, as an easing of the supply chain crisis enabled the company to fulfill back orders and increase quarterly revenue by 16% year over year, reaching a total of $15.2 billion.Cisco’s said that total software-related revenue was up 17% year on year, and revenue from software subscription services rose 20%. That’s part of what the company refers to as its business model transformation, as slack overall demand for collaboration technology resulting from the easing of the pandemic creates the need for Cisco to target new types of business.Net income for the quarter jumped 41% year over year to $4 billion.To read this article in full, please click here

BrandPost: Why working from home just got better (Hint: it’s your Wi-Fi)

By: Gayle Levin, Senior Product Marketing Manager for Wireless at HPE Aruba Networking. Whether we work from home every day or just occasionally, we’ve grown accustomed to blaming the network for poor performance. There’s an ethos of “we just have to deal with it because it’s part of working remotely.” But dealing with it day after day gets old. That’s why I’m so excited about the new HPE Aruba Networking Access Points, designed to make working from home more efficient. They’re designed to conveniently fit on the desktop and can be managed using HPE Aruba Networking Central’s capabilities. Central includes dashboards that provide WAN health insights, enabling IT to troubleshoot issues whether they are due to the corporate network, applications, or even public ISPs.To read this article in full, please click here

Introduction to VXLAN

In the previous post, we looked at some of the challenges with L2-based networks. Now let’s start diving into what VXLAN is and what it can provide. First, let’s talk about overlays.

Overlays

Overlays are not new. We have had overlays for many years. The most well known ones are probably GRE and MPLS. In general, overlays are used to create a level of indirection that extends network capabilities. For example, MPLS L3 VPNs provided some of these capabilities to IP networks:

  • Segmentation.
  • Overlapping IPs.
  • Custom topologies.
  • Scaling.
  • Multihoming.

With overlays, intelligence is often pushed to the edge of the network while intermediate devices can be “dumb”. This can reduce costs as not all devices need the advanced features. How does an overlay work? To create the indirection, the original frame or packet needs to be encapsulated. Depending on the type of overlay, the frame or packet could get encapsulated into another frame or packet. The transport between the overlay nodes is called the underlay. This is the network that transports packets between the nodes. For VXLAN, this is a layer 3 network.

Because overlays encapsulate frames or packets, the size of the frame or packet will increase. To compensate Continue reading

Chipping Away

So far, the silicon technology at the heart of this revolution has been truly prodigious. The processes of assembling silicon wafers and the superimposition of tracks and gates hs been the subject of continual refinement, and some 75 years after the invention of the transistor we are now able to cram almost a trillion of them onto a silicon wafer not much biggeer than a fingernail. Have we reached the end of this silicon road, or is there more to come?

Data replication works best when combined with robust backups

Data replication has stood the test of time, providing organizations with a reliable means of safeguarding critical information for decades. Replication creates redundant copies of vital data, ensuring its availability and resiliency in case of disasters or system failures. In this article, I will explore the intricacies of data replication, examining its fundamental components, types, and potential limitations.Data replication starts with the selection of a source volume or filesystem that needs protection. This source volume might be a virtual disk, often referred to as a LUN (logical unit number), sourced from a storage array or volume manager. It may also take the form of a filesystem. Replication can occur either at the block level, a common practice due to its efficiency, or at the filesystem level, although the latter tends to be less favored for its relatively inferior performance.To read this article in full, please click here

Data replication works best when combined with robust backups

Data replication has stood the test of time, providing organizations with a reliable means of safeguarding critical information for decades. Replication creates redundant copies of vital data, ensuring its availability and resiliency in case of disasters or system failures. In this article, I will explore the intricacies of data replication, examining its fundamental components, types, and potential limitations.Data replication starts with the selection of a source volume or filesystem that needs protection. This source volume might be a virtual disk, often referred to as a LUN (logical unit number), sourced from a storage array or volume manager. It may also take the form of a filesystem. Replication can occur either at the block level, a common practice due to its efficiency, or at the filesystem level, although the latter tends to be less favored for its relatively inferior performance.To read this article in full, please click here

Endace Debuts Packet Capture Software For Public Clouds

Endace has announced a new offering that can capture packets inside your public cloud deployments. Called EndaceProbe Cloud, the offering is available for AWS and Azure public clouds. It can also be deployed in VMware-based private clouds. Why capture packets in the cloud? Endace says the top two customer drivers are security and performance monitoring. […]

The post Endace Debuts Packet Capture Software For Public Clouds appeared first on Packet Pushers.

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