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Category Archives for "Networking"

IDG Contributor Network: Why your network needs the power of a platform

Evolving your network to have the characteristics of a platform is a core requirement of the Pervasive Network. The goal is to have a network that delivers greater value by reducing operational costs, while allowing for the rapid addition of new functionality and services to consumers, wholesale players or Industry X.0 – the emerging modern enterprise defined by cyber-physical production systems that combine communications, IT, data and physical elements. It is the enabler of many of the new technologies – 5G, VR and IoT – that are driving massive industry disruption and bringing new consumer services and industry solutions to market. To achieve this the network needs to adopt the characteristics of a successful software platform such as Google, Amazon or Facebook:To read this article in full, please click here

How did Linux come to dominate supercomputing?

After years of pushing toward total domination, Linux finally did it. It is running on all 500 of the TOP500 supercomputers in the world, and who knows how many more after that. That’s even more impressive than Intel’s domination of the list, with 92 percent of the processors in the top 500.So, how did Linux get here? How did this upstart operating system created by a college student from Finland 26 years ago steamroll Unix, a creation of Bell Labs and supported by giants like IBM and Sun Microsystems and HP, Microsoft’s Windows, and other Unix derivatives?To read this article in full, please click here

How did Linux come to dominate supercomputing?

After years of pushing toward total domination, Linux finally did it. It is running on all 500 of the TOP500 supercomputers in the world, and who knows how many more after that. That’s even more impressive than Intel’s domination of the list, with 92 percent of the processors in the top 500.So, how did Linux get here? How did this upstart operating system created by a college student from Finland 26 years ago steamroll Unix, a creation of Bell Labs and supported by giants like IBM and Sun Microsystems and HP, Microsoft’s Windows, and other Unix derivatives?To read this article in full, please click here

IDG Contributor Network: Network verification: predicting the future of complex networks

Across all sorts of networks today – in enterprises large and small, service providers, government agencies, and beyond – there is a transformation towards a software-driven architecture. Where procedures were once manual, they are becoming more automated, driven perhaps foremost by the need for agility, while maintaining availability and protection.That transformation is coming in a broad arc, not a single drop-in solution, and the industry is still figuring it all out; you’ll see me write more about “softwarization” of the network here in the future. In this post, I’ll discuss a burgeoning aspect of this transformation towards automation: a new technology called network verification, which helps predictively ensure that business goals match reality, even throughout frequent change. With this automated assurance of resilience and security intent, the network can become more agile. And network verification does that with math!To read this article in full, please click here

IDG Contributor Network: Network verification: predicting the future of complex networks

Across all sorts of networks today – in enterprises large and small, service providers, government agencies, and beyond – there is a transformation towards a software-driven architecture. Where procedures were once manual, they are becoming more automated, driven perhaps foremost by the need for agility, while maintaining availability and protection.That transformation is coming in a broad arc, not a single drop-in solution, and the industry is still figuring it all out; you’ll see me write more about “softwarization” of the network here in the future. In this post, I’ll discuss a burgeoning aspect of this transformation towards automation: a new technology called network verification, which helps predictively ensure that business goals match reality, even throughout frequent change. With this automated assurance of resilience and security intent, the network can become more agile. And network verification does that with math!To read this article in full, please click here

It’s Bash Scripts All the Way Down (more on CLI versus API)

Netfortius made an interesting comment to my Ansible playbook as a bash script blog post:

Ivan - aren't we now moving the "CLI"[-like] approach, upstream (the one we are just trying to depart, via the more structured and robust approach of RESTAPI).

As I explained several times, I don’t know where the we must get rid of CLI ideas are coming from; the CLI is root of all evil mantra is just hype generated by startups selling alternative approaches (the best part: one of them was actually demonstrating their product using CLI).

Read more ...

Rapid Spanning Tree Protocol and Configurations – RSTP

Today I am going to talk about the widely used protocol in the switching scenarios called as Rapid Spanning tree protocol. RSTP all you know that is a enhanced version of the STP (Spanning Tree Protocol) and is now used in many of the LAN networks there in enterprises.

Before we talk about RSTP further,  I would like to tell you guys that we have our own youtube channel for various network videos that can further help you guys to study further. I will going to add many more videos soon on the channel, Please subscribe to the channel for the study network related videos

Subscribe us on Youtube: http://y2u.be/0c4lMYVp9go

RSTP- Rapid Spanning Tree Protocol
Replacing the concept of 5 port states in STP, RSTP comes up with the 3 port states only and these port states are discarding, learning and forwarding. 

Fig 1.1- STP Topology
STP has 5 states and these states are Blocking, Listening, Learning, Forwarding and Disabled where we replaced the blocking, listening and discarding with the discarding state in RSTP. Below is the table showing the states of the STP and RSTP

Fig 1.2- STP and RSTP Port States
Now the question is Continue reading

Helping Resolvers to help the DNS

Here, I'd like to look at ways that recursive resolvers in the DNS can take some further steps that assist other parts of the DNS, notably the set of authoritative name servers, including root zone servers, to function more efficiently, and to mitigate some of the negative consequences if these authoritative name servers are exposed to damaging DOS attacks.

Hiding the DNS

I’d like to look in a little more detail at the efforts to hide the DNS behind HTTPS, and put the work in the IETF's DOH Working Group into a broader perspective. There are a number of possible approaches here, and they can be classified according to the level of interaction between the DNS application and the underlying HTTPS encrypted session.

DNS and DDOS

It took some hundreds of years, but Europe eventually reacted to the introduction of gunpowder and artillery by recognising that they simply could not build castles large enough to defend against any conceivable attack. So they stopped. I hope it does not take us the same amount of time to understand that building ever more massively fortified and over-provisioned DNS servers is simply a tactic for today, not a strategy for tomorrow.

VyOS 1.1.8 Released

More than one year after publishing a previous VyOS version, the new VyOS 1.1.8 is finally released. VyOS is an open source network operating system that can be installed on physical hardware or as a virtual machine. It is based on GNU/Linux and joins multiple applications such as Quagga, ISC DHCPD, OpenVPN, StrongS/WAN and others under a single management interface. VyOS is a cheap and effective solution for those who want to learn Junos like CLI.

Linux user can use my installation scripts for zero-touch VyOS deployment. Scripts download the newest stable VyOS x86-64 Live ISO image from web, create VMware VMDK disk and install VyOS from ISO on the disk. The scripts are available here (part 1.1).

Picture 1 - VyOS Version 1.1.8

Note: The scripts are tested on Linux with installed Qemu, KVM and Expect. First,  run the Bash script deploy vyos.sh. The script downloads the latest VyOS ISO image. Then run the Expect script install vyos.exp  that  install on VyOS Live CD.

vCentre in Azure

A recent project I was working on involved the need to join a new office to our existing Data Centres and OSPF core using a Gig circuit over the Internet. To flesh out this idea and test its viability I thought I would try and solve an ESX capacity problem I have at home by moving vCentre into the cloud.

Load Balancers Comparisons: F5 Vs KEMP Vs Citrix

Today I am going to discuss about the comparison between the load balancers which are generally best with their features and also Gartner rated them high in their reports. Load Balancers are the basic and the important need of the Enterprise network now a days. Some of the them used as Local and some of them used as Global Load Balancers. 


Before we talk about Load balancers,  I would like to tell you guys that we have our own youtube channel for various network videos that can further help you guys to study further. I will going to add many more videos soon on the channel, Please subscribe to the channel for the study network related videos

Subscribe us on Youtube: http://y2u.be/0c4lMYVp9go

As per the Gartner report, F5 BIG-IP leads the magic quadrant in leaders with Citrix and KEMP is also gaining the speed in Challengers. Although we have many more vendors in the market of load balancers like Radware, A10 Networks, Brocade, Barracuda Networks, Cisco and Array Networks. F5 is leading the market with the best features and capable of doing a lot of best performance and security features as well. I will discuss the comparison at Continue reading

Using Telegraf, InfluxDB and Grafana to Monitor Network Statistics

Two years ago I wrote about how to use InfluxDB & Grafana for better visualization of network statistics. I still loathe MRTG graphs, but configuring InfluxSNMP was a bit of a pain. Luckily it’s now much easier to collect SNMP data using Telegraf. InfluxDB and Grafana have also improved a lot. Read on for details about to monitor network interface statistics using Telegraf, InfluxDB and Grafana.

Background - Telegraf, InfluxDB + Grafana

There’s three parts to this:

  • Grafana: Grafana is “The open platform for beautiful analytics and monitoring.” It makes it easy to create dashboards for displaying data from many sources, particularly time-series data. It works with several different data sources such as Graphite, Elasticsearch, InfluxDB, and OpenTSDB. We’re going to use this as our main front end for visualising our network statistics.

  • InfluxDB: InfluxDB is “…a data store for any use case involving large amounts of timestamped data.” This is where we we’re going to store our network statistics. It is designed for exactly this use-case, where metrics are collected over time.

  • Telegraf: Telegraf is “…a plugin-driven server agent for collecting and reporting metrics.” This can collect data from a wide variety of sources, Continue reading

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