Category: Networking

GNS3. Basic Installation.

Introduction This post gives an overview of GNS3 software and shows how to install it. It is a part of GNS3 Tutorial series. What is GNS3? GNS3 is a free network emulation software with GUI that can be used to run real network OS (for example, Cisco IOS) images, and build various network topologies in

How to capture traffic on Cisco ISR 4000 ?

Introduction In this article we will see how we can capture and export network traffic on a Cisco ISR 4331. The provided instructions are applicable to any Cisco ISR 4000 series router. The exported traffic has a pcap file format and therefore can be easily opened and analyzed in Wireshark. The ISR 4331 used in

Voice VLAN on HPE OfficeConnect 1920S.

Introduction In this post we will configure voice vlan on HPE OfficeConnect 1920S switch. The switch will be used for connecting Cisco 8851 IP phone, which will detect the Voice VLAN and get an IP address from the correct VLAN. The PC connected through the IP phone will remain in a Data VLAN. The exact

IRF stack configuration (2 x HPE 5130 switches).

Introduction In this article we will setup an IRF stack with two HP 5130 switches that run Comware OS. What is IRF? IRF (Intelligent Resilient Framework) is a proprietary virtualization/stacking technology used in some HPE switches. It has been developed originally by H3C, but later HPE acquired H3C. IRF allows us to interconnect several switches

How to run Cisco router as a virtual machine?

Introduction In this post we will learn how to install and run Cisco router as a virtual machine. Cisco has a special product called CSR (Cloud Services Router) 1000v for deploying routers as virtual machines. You can use these VMs for testing and learning purposes. Cisco supports all popular cloud and virtualization platforms, but I

Port Forwarding on Fortigate

Introduction In this post we will configure port forwarding on a Fortigate firewall running FortiOS 5.4. What is Port Forwarding? Port forwarding is a feature on the routers/firewalls that allows devices behind the NAT to be accessed by external devices. In other words, if you want anyone on the Internet to access a service (e.g.

Mininet Tutorial

What is Mininet? Mininet is a software that emulates virtual network environment with OpenFlow support. It is great for learning, prototyping and testing SDN features and applications.   How to install Mininet? There are several ways you can install Mininet. The easiest and recommended one is to go to https://github.com/mininet/mininet/wiki/Mininet-VM-Images and download the image for your