There are many ways you could configure a DNS server. If you are a network engineer and wanted to build a private DNS server for a small office, you would rather set up a router as a DNS server than configuring a Linux or a Windows machine for the same purpose, right ? In this lab, we are going to … Read More
9 Reasons Why You Need to Use a VPN
Countries around the world are going above and beyond to protect their citizens from internet threats. One example is that in some countries, which has made it impossible for its citizens to access social media sites. And in some of the western countries, they are using the internet to invade its citizens’ privacy, it only makes sense to protect yourself … Read More
Discover the Netplan network configuration in Ubuntu
Ever since Ubuntu changed it’s network configuration to netplan from traditional configuration, many of them got so upset. Some of them are very annoyed to the point they even entirely removed the netplan and installed ifupdown back to the system again. So is Netplan going to stay ?, if yes shouldn’t we learn how to configure them on our Ubuntu … Read More
What is an ASN in BGP?- All you need to know about AS numbers
We all have configured Routing protocols and heard about the term ASN/AS numbers (Autonomous system number). However, when it comes to BGP, have you ever wondered what ASN really is and how you can get one?In this blog, let’s answer what ASN is in the BGP routing protocol, and it’s differences and types. A BGP public ASN or AS number … Read More
8 Easy steps to configure Linux (Centos, Rhel, Ubuntu) as NTP servers
If you have a Linux machine (Ubuntu, Centos, Redhat) running in your environment and you would want to configure them as an NTP server it is pretty easy. In our last blog, we took a look at what is NTP and how to configure the public and private NTP servers. In this blog, we are going to configure the Linux … Read More
4 easy step to install CentOS on Linux KVM
CentOS is one of my favorite Linux distros, I have been using them for quite a while for my labs as well as in POC’s. If I have to do some testing in the Redhat production servers I would prefer to use Centos as an alternate as both are identical and configuration looks the same and Centos doesn’t require a … Read More
10 Easy steps to install Windows 10 on Linux KVM
I usually use the windows machine as a jump server inside my labs, that way I can move around the files and stuff quickly, sometimes I install the windows machine on the ESXi host else I would install it on the KVM. For some, they wanted to use windows machines on their Linux box. They can either install Vmware workstation … Read More
[Solution] How to extend windows storage in KVM?
I have one windows machine that I use as an alternate operating system in my Linux KVM. Recently I noticed that the C drive in my windows got filled up and there is not enough space left to store any more data. How we can get around this issue? All we have to do is increase the storage on the … Read More
10 easy steps to install ubuntu 19.04 on VMware workstation 15
When you are a network engineer or a developer, you may want to test your skills in a virtual environment rather than playing with your machine or production environment. Because you never know what could go wrong. What is VMware’s workstation and Fusion? VMWare workstation pro is a Software program that would let you install different operating systems, be it … Read More
What is NTP? Configure Routers as the NTP server
What do you think is the best way for Network hosts to update its clock automatically?The answer to that is to use an NTP server, in this article lets find out what is NTP and its stratum values, and we would also configure Cisco and Comware routers as the NTP public and private servers. What is NTP Server? An NTP … Read More
Best way to Stream VLC videos on your local network
The VLC media player is great if you wanted to watch videos on your computer, tablet, or even on your smartphone. And the best part about this media software is that it not only play videos locally it also helps you play videos over the network, meaning you can make your local machine as video server and stream the videos. … Read More
Discover the difference between overlay and underlay networks – Part-8
The overlay and underlay networks are quite difficult to understand at first but it is pretty easy, in this blog lets go over the differences between underlay and overlay networks also do a lab to make more sense. This is also the continuation of the nuage SD-WAN lab setup. Initially, I thought I would just install all the Nuage SD-WAN … Read More
Step by Step to Configure Cisco Router as DHCP server in GNS3
I know how does DHCP works, but what if I want to configure my router as a DHCP server as well, is it possible? the answer is YES!, You can configure the Cisco router as the DCHP server and this blog we are going to cover the same. In the last blog, I covered how we can configure the Cisco … Read More
[Solution] How to Configure SNMP on Rhel (Redhat) or CentOS
The other day I was working on adding some of the Redhat servers in production for monitoring. I also got the SNMP community string from the team who is managing the monitoring tools as well. I even informed them I would configure the SNMP on the server in another 5mins :).Do you know what happened when I logged into the … Read More
Easy way to connect GNS3 to the Internet on Windows host
The gns3 has evolved from just a simulator for Cisco IOS to a multivendor environment.You can simulate the physical network virtually in gns3 and it works great! Wouldn’t be cool if we can get the host internet access shared to the gns3 that way the devices in gns3 can access the internet and you can do a lot more with … Read More
Nuage NSG bootstrapping – Part 7
Even though we have virtual Nuage NSG, let’s think for a second that we have got a brand new NSG’s at our branch locations and we are going to deploy them as Branch 1 and two like below. 🙂 1.Creation of NSG in an Enterprise. The first step for the NSG bootstrapping is to create an NSG in the enterprise. … Read More
Creation of Nuage SD-WAN gateway (NSG) in VSD – Part 6
How you install the traditional network devices?A skilled technician would go on to the site to deploy the router and connect cables on them and make sure everything is working.But how to implement SD-WAN gateway? You cannot install SD-WAN gateway in our case NSG (Network Service Gateway) just like that. You would have to do a process called NSG bootstrapping … Read More
Nokia Nuage SDWAN Controller (Nuage VSC) deployment – Part 4
In our last section of the Nuage sdwan lab setup, we had installed VSD, which is the nuage networks VNS management plane. In this section of the nuage lab guide, we would go ahead and install a nuage SD-WAN controller known as VSC (Virtual Service Controller.) We would be using two SDN controllers for high availability. One would be acting as primary, and the other … Read More
Nuage Proxy server deployment – SDWAN lab -Part 5
Yes, we are almost there to get everything up and run.! I am building this lab for you guys and at the same time, writing this post, that way I hope everything would be accurate. In this lab, we are going to install the Nuage proxy server, also known as nuage utility VM, so let’s get started. Why Nuage SD-WAN … Read More
Nokia Nuage SDWAN Lab- VSD installation steps – Part 3
In my previous blog, I covered the underlay network setup for Nuage in KVM. In this blog, I am going to cover the Nuage VSD installation lab guide and on the next part of the blog, we would go through the installation of the nuage components one by one. Prerequisite for the lab. There are some prerequisites for this lab … Read More
How to create Bridge and Vlan sub-interfaces in Linux – Nuage SD-WAN lab Part 2
What is the underlay and Overlay network? When it comes to Nuage-SDWAN there are two types of networks that we have to use. First one is called the underlay network and the second one is called the overlay network. The underlay network is nothing but our traditional network which would help us to connect all the network equipment. Once the … Read More
Step by Step guide to install Nuage SD-WAN lab in KVM – Part 1
You are here because you wanted to learn about Nuage SD-WAN and its lab setup. For me, I don’t like to read more of theory when it comes to learning new technologies. I would instead do a lab first and make some mistakes and learn from them. By the time I finish the lab, I would know more about the … Read More
How to Integrate VMware, VirtualBox, Qemu Vm’s in GNS3
I like to work on physical equipment when it comes to networking, but what if I cannot afford to own one, then the only option is to Virtualise them. I have been running a virtualized environment for both for my Network POC’s and the Lab’s for years now using Gns3. Since Gns3 supports a lot of different ways you can … Read More
[Solution] You need at least 8.6GB disk space to install Ubuntu. The computer has only 2.0GB
I was working on a topology where I had to add a Ubuntu desktop client to simulate the end-user machine. I tried to install Ubuntu on the KVM hypervisor. Downloaded the Ubuntu ISO file, moved the Ubuntu-desktop ISO file to /var/lib/libvert/images folder on the KVM server I was working on. Selected network configuration and started the VM installation. There were … Read More
[Solution] GNS3 could not connect | Gns3 common errors
It’s common in gns3 that you end up getting the error messages now and then when you are working on different topologies. Moreover, it frustrates us when we cannot find a way around to fix it.In this article, I am going to cover some of the error messages that I have received. Also, how I have troubleshot them. Below are … Read More
5 Steps to change the display resolution in Linux
When you install Redhat Linux enterprise on a server, by default, it takes the display resolution as 800 x 600 or 1024 x 768. Also, when you go to display settings, you would be disappointed to see there are no options available to increase the display resolution either. You can change the display resolution RedHat and centos machine by following … Read More
How does DHCP work in the network
How does DHCP work in the network? Before we answer that question, we need to understand the different ways of configuring the IP addresses.You could use either DHCP or static IP configuration. You might already know the configuration of IP address statically on a computer. It requires you to go to the network properties of the network hosts and manually … Read More
What is Border Gateway Protocol (BGP)? All you need to know about BGP.
Most of the network professionals whom I know are very good at configuring and fine-tuning the internal routing protocols, and when I ask them about configuring BGP, they are like, ‘you know what, I am not so confident with it maybe I think I have to read a bit more about it before I spin up in the production. So … Read More
Step by step guide to install Ubuntu on Virtualbox
Installing Ubuntu on Virtualbox box is very easy, in this blog, I am going to show you how you can install ubuntu 19.04 on Oracle VirtualBox step by step, this Ubuntu VM also can be integrated into the GNS3 if you are working on network topologies and stuff. Ubuntu VM installation prerequisites. Download and install VirtualBox on your local machine … Read More
[Solution] device eth0 does not seem to be present, delaying initialization centos
The other day I was working on a POC lab where I had to simulate a DNS server (Centos version 7) in GNS3. I think it was for one of the nuage sdwan gns3 labs.Took a copy of centos DNS VM from existing KVM host, added into gns3 by going to edit preferences and under Qemu VM’s. Dragged the Centos … Read More
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