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Category Archives for "Networking"

Time and Mind Savers: RSS Feeds

I began writing this post just to remind readers this blog does have a number of RSS feeds—but then I thought … well, I probably need to explain why that piece of information is important.

The amount of writing, video, and audio being thrown at the average person today is astounding—so much so that, according to a lot of research, most people in the digital world have resorted to relying on social media as their primary source of news. Why do most people get their news from social media? I’m pretty convinced this is largely a matter of “it saves time.” The resulting feed might not be “perfect,” but it’s “close enough,” and no-one wants to spend time seeking out a wide variety of news sources so they will be better informed.

The problem, in this case, is that “close enough” is really a bad idea. We all tend to live in information bubbles of one form or another (although I’m fully convinced it’s much easier to live in a liberal/progressive bubble, being completely insulated from any news that doesn’t support your worldview, than it is to live in a conservative/traditional one). If you think about the role of Continue reading

Network Break 327: Cisco Embraces As-A-Service Procurement; Will Amazon Make Its Own ASICs?

Today's Network Break sifts through the most interesting news from Cisco Live 2021 including an as-a-service procurement model, support for biometric-based authentication, integrating ThousandEyes and AppDynamics, and more. We also examine reports that Amazon is designing its own switch ASIC, and discuss new research on harvesting power from 5G electromagnetic waves.

The post Network Break 327: Cisco Embraces As-A-Service Procurement; Will Amazon Make Its Own ASICs? appeared first on Packet Pushers.

Network Break 327: Cisco Embraces As-A-Service Procurement; Will Amazon Make Its Own ASICs?

Today's Network Break sifts through the most interesting news from Cisco Live 2021 including an as-a-service procurement model, support for biometric-based authentication, integrating ThousandEyes and AppDynamics, and more. We also examine reports that Amazon is designing its own switch ASIC, and discuss new research on harvesting power from 5G electromagnetic waves.

CONTAINERlab

CONTAINERlab is a Docker orchestration tool for creating virtual network topologies. This article describes how to build and monitor the leaf and spine topology shown above.

Note: Docker testbed describes a simple testbed for experimenting with sFlow analytics using Docker Desktop, but it doesn't have the ability to construct complex topologies. 

multipass launch --cpus 2 --mem 4G --name containerlab
multipass shell containerlab

The above commands use the multipass command line tool to create an Ubuntu virtual machine and open shell access.

sudo apt update
sudo apt -y install docker.io
bash -c "$(curl -sL https://get-clab.srlinux.dev)"

Type the above commands into the shell to install CONTAINERlab.

Note: Multipass describes how to build a Mininet network emulator to experiment with software defined networking.

name: test
topology:
nodes:
leaf1:
kind: linux
image: sflow/frr
leaf2:
kind: linux
image: sflow/frr
spine1:
kind: linux
image: sflow/frr
spine2:
kind: linux
image: sflow/frr
h1:
kind: linux
image: alpine:latest
h2:
kind: linux
image: alpine:latest
links:
- endpoints: ["leaf1:eth1","spine1:eth1"]
- endpoints: ["leaf1:eth2","spine2:eth1"]
- endpoints: ["leaf2:eth1","spine1:eth2"]
- endpoints: ["leaf2:eth2","spine2:eth2"]
- endpoints: ["h1:eth1","leaf1:eth3"]
- endpoints: ["h2:eth1","leaf2:eth3"]

The test.yml file shown above specifies the topology. In this case we are using FRRouting (FRR) containers for the leaf Continue reading

It’s Not What You Say. It’s How You’re Heard.

In written communication, technical people can sometimes come across as impolite. I see this on Slack (talking down), Twitter (the angry tweeter), in emails (blunt and terse), in blog comments (bitter sarcasm or pedantry), Hacker News discussions (aggressive confrontation), and other places IT builders gather online.

Perhaps you, as just such a technical person, don’t mean to be impolite. Maybe your focus is on efficiency. Get to the point. Say what needs saying, however it comes out. Click send. Job done. Go back to facepalming at the Swagger docs explaining this ill-considered API you need to use.

Here’s the problem with your communications approach. To the person receiving your missive, you might sound like you’re upset. Or tone-deaf. Or maybe just a jerk. You’re presumably none of those things, at least not intentionally. We’re all nice folks who want to get along with our fellow humans, right?

It’s not what you say. It’s how you’re heard.

You need to communicate in such a way that you’re heard as you mean to be heard. If you’re not good at this and want to be, you can improve your messaging.

Before hitting send, engage in role reversal. If you received a Continue reading

The Week in Internet News: Biden Wants Broadband for All

Filling the gaps: U.S. President Joe Biden has proposed spending $100 billion over eight years to bring broadband to all areas of the country, CNet reports. The broadband spending is part of a $2.25 trillion infrastructure proposal, which would also include repair of roads and bridges and improvements to the water supply and electrical grids. […]

The post The Week in Internet News: Biden Wants Broadband for All appeared first on Internet Society.

Tools 6. Where are my packets lost? MTR edition.

Hello my friend,

after show pause we continue our blog series about the most popular network troubleshooting tools, which humankind has ever created. Today we’ll take a look at one of the most useful tool to obtain the information about the path between two endpoints and possible packet drops over that path. Ladies and gentlemen, please, welcome MTR.


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No part of this blogpost could be reproduced, stored in a
retrieval system, or transmitted in any form or by any
means, electronic, mechanical or photocopying, recording,
or otherwise, for commercial purposes without the
prior permission of the author.

Can automation help with figuring what happened where?

In case of the infrastructure problems (networks, servers, VMs, containers), the time matters a lot. The quicker we can find the issue and fix that, the better it will be for our applications and our customers. Automation without doubts one of the key components, which allows you to quickly find and fix your issues.

In our trainings, the Live Network Automation Training (10 weeks) and Automation with Nornir (2 weeks), we explore a lot of real use cases, where the automation helps you to validate the state of you Continue reading

Building Unnumbered Ethernet Lab with netsim-tools

Last week I described the new features added to netsim-tools release 0.4, including support for unnumbered interfaces and OSPF routing. Now let’s see how I used them to build a multi-vendor lab to test which platforms could be made to interoperate when running OSPF over unnumbered Ethernet interfaces.

I needed to define an unnumbered addressing pool first:

addressing:
  core:
    unnumbered: true

I wanted to run OSPF on all devices in the lab:

module: [ ospf ]

Building Unnumbered Ethernet Lab with netlab

Last week I described the new features added to netsim-tools release 0.4, including support for unnumbered interfaces and OSPF routing. Now let’s see how I used them to build a multi-vendor lab to test which platforms could be made to interoperate when running OSPF over unnumbered Ethernet interfaces.

  • This blog post has been updated to use the new netlab CLI introduced in netsim-tools release 0.8 and new IPAM features introduced in release 1.0
  • netsim-tools project has been renamed to netlab.

BiB100: Zero Trust With Araali Networks

Today’s briefing summary is about startup Araali Networks, one of the most interesting startups we’ve chatted with in a while. Abhishek Singh, CEO and co-founder, gave Ethan Banks and Drew Conry-Murray at Packet Pushers an overview of their approach to modern application security on March 31, 2021.

It’s time for Enterprise Cloud Networking

It’s time to get things cranking here again and a big topic is going to be enterprise cloud networking. What I mean by that in simple terms is how an enterprise can use the networking services of cloud providers to build, migrate, and run their most important applications in the cloud.

Over the last 6 years a lot has happened in the shift to public cloud. I don’t need to explain that to you. We already know that building and migrating applications in/to the cloud is what the world is doing – and for reasons that no longer need explaining.

What’s more interesting now is that the term “the cloud” used to mean one thing: Amazon Web Services. Six years ago, when you said to somebody, “Yeah, so, we are going to migrate this application to the cloud.” – nobody asked what cloud you were talking about and why.

And in the very same stride “cloud networking” implied AWS Networking. If you told somebody that you were a cloud network architect, nobody questioned that either. It meant that you knew AWS VPC, Direct Connect, Route 53, NAT Gateways, Security Groups, VPC subnets and route tables, the various AWS instances Continue reading

Nokia Lab | LAB 1 Basic |


Introduction 

Hi there!

I'm starting a series of notes focused on Nokia SR-OS labs. It's a part of my preparing for NRSII and SRA.

Some input points:
  • Labs contain: tasks and questions, topology, final configs, useful debug commands, and different tips;
  • It’s not a lab guide. it’s just my notes which may be useful for someone. I will try to give the right structure of labs and ask reasonable questions. But you can use them as a reference for your own labs. Change everything and have fun :)
  • I make more emphasis on structure and coverage than explanation and step-by-step configuration. In my opinion, step-by-step guides or Youtube tutorials are unuseful for exam preparing or learning something. It's looking like entertainment content. So I don't provide answers,  CLI outputs, debug outputs, traffic dumps. I'm sure you should try it yourself.
  • I use TiMOS-B-12.0.R6 (It’s temporary)

Topology example








Lab tasks and questions:
  • card provisioning
  • provision card and MDA
  • examine card and MDA status
  • examine card and MDA detail info
  • ports configuration
  • enable ports
  • examine ports status
  • What is a default port mode?
  • What’s a default port MTU for every port mode?
    • L3 interface configuration(ipv4 and ipv6)

    Heavy Networking 571: Network Automation Workflows With Jenkins

    Today on Heavy Networking, we talk about how to roll your own network automation workflow. Guest Steve Puluka has developed an automation workflow system that uses GitLab and Jenkins, among other tools, to make sure the network devices he supports are pure gold. We talk about how it works, and how you can put your own together.

    The post Heavy Networking 571: Network Automation Workflows With Jenkins appeared first on Packet Pushers.