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
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
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 this case in GNS3. It was for one of the nuage sdwan gns3 labs I was working on.Took a copy of centos DNS VM from existing KVM host, added into gns3 by going to edit preferences and under … Read More
5 Easy steps to configure Palo-Alto firewall in Gns3
When you wanted to practice Paloalto lab by yourself, you have got multiple options. You could try physical gears if you can afford one, else virtualize them. In this blog, we are going to configure the Paloalto firewall in gns3. We are going to install a Paloalto firewall with management IP and one public-facing interface with the internet. There are … Read More
(Solution) RIP not working in IOU gns3
I was working on my CCIE BGP lab the other day using Cisco IOU.While I was at it I had to advertise Loopback interfaces using Rip ver 2 so that I could create IBGP full mesh using the loopback. but it turns out, RIP was not working in my lab. This was the network topology I was working on. Testing … Read More
Arp protocol – Discover how ARP works in the real world
If you are new to networking you must have heard the term called ARP protocol – address resolution protocol many times.You may be wondering or even confused. Well, what is the ARP protocol and how ARP works in the real world? Before we talk about how arp works we need to know something called a mac address. What is a … Read More
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