Tag Archives: Ubuntu

TFTP on Ubuntu 14.04 LTS server

ubuntu-logo32In this post I will run through the installation and verification of operation of a Trivial File Transfer Protocol (TFTP) server running on Ubuntu 14.04 LTS. TFTP is an Internet software utility for transferring files between networked devices, that is simpler to use than the File Transfer Protocol (FTP) but less capable and less secure. It is used where user authentication and directory visibility are not required. TFTP uses the UDP port 69 as its transmission layer protocol making it lighter than TCP based FTP. TFTP is described formally in RFC 1350. Continue reading TFTP on Ubuntu 14.04 LTS server

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Adding VPCS to GNS3 v1.1

gns3_icon_256x256I love using GNS3 when I am studying as I can integrate a Virtual Machine, running a TACACS+ server for example, however this does come at a cost of CPU and RAM utilization.

I don’t always need a full Linux VM running when all I want to do is ping or traceroute between two hosts on the network, this is where Virtual PC Simulator (VPCS) comes into play. VPCS is a lightweight PC simulator that has a basic set of network commands such as ping, traceroute and telnet. It does not consume the CPU and memory resources that adding another router or VM would use. VPCS can simulate up to 9 separate  PC at a time. Continue reading Adding VPCS to GNS3 v1.1

Linux IP Subnetting Tools

unnamedIP subnetting is one of the core topics that is covered in the CCNA and is something that every network engineer worth his/her salt will be able to do in their head. Having said that though, there are times when you just cant be bothered to do it in your head, we are human after all and by default lazy. Continue reading Linux IP Subnetting Tools

Cisco IOS XRv in GNS3 using VirtualBox

Icisco-logo-transparent-backgroundf you are studying for your CCNA SP exam, or work with IOS XR and would like to learn more about the way IOS XR works you can now install IOS XRv in VirtualBox and integrate it with GNS3 version 1.1. In the following post I will describe the steps of setting up VirtualBox and GNS3 version 1.1 to use IOS XRv on Ubuntu 14.0.4. Continue reading Cisco IOS XRv in GNS3 using VirtualBox

TACACS+ on Ubuntu 14.04 LTS

ubuntu-logo32In this post I will be describing the steps required to install TACACS+ on Ubuntu 14.04 LTS. I will be compiling the TACACS+ daemon with ACL support for additional security.

I will also run through the basic configuration of Cisco devices to use TACACS+ for Authentication, Authorisation and Accounting. Continue reading TACACS+ on Ubuntu 14.04 LTS

GNS3 v1.1 install on Ubuntu 14.04 LTS

gns3_icon_256x256In this post I will be running through the installation of the public release of GNS3 version 1.1 on a clean install of Ubuntu 14.04 LTS.

I am using the Ubuntu Gnome 14.04 LTS distribution, however I have also tested it on a clean install of the standard Ubuntu 14.04 LTS with unity Continue reading GNS3 v1.1 install on Ubuntu 14.04 LTS

Connect GNS3 to the Internet

gns3_icon_256x256It is always useful to be able to connect your GNS3 labs to a real world network such as a physical Lab network of real Cisco devices, connected to you PC, or even to the Internet.

In this post I will provide step by step instructions to connect your GNS3 install to a physical network and to connect to the internet. Continue reading Connect GNS3 to the Internet