CCNA Certification Blog

GNS3 is fantastic software that you can use to emulate Cisco router, firewall, and IPS devices. Additionally, you also emulate Juniper operating system (JunOS). GNS3 can be installed on Windows, Linux and Mac OS operating systems. In a previous post, you’ve seen how to install GNS3 on a Windows-based computer. In this post, you learn how to install it on Ubuntu. It is recommended to use GNS3 on Ubuntu rather than on Windows because Ubuntu is more stable and optimize the CPU usage. Therefore, it gives better performance than Windows.

Watch the following video in order to learn how to setup GNS3 on Ubuntu. if you have any question, post it in the comments section.

GNS3 works well in Ubuntu rather than on Windows-based computers. However, a lot of people have trouble with the xTerm console because it does not allow copy/paste function. Additionally, you cannot open a lot of telnet into one window. The following is the default configuration for terminal connections on GNS3.

xterm -T %d -e ‘telnet %h %p’ >/dev/null 2>&1 &

In order to avoid the issues discussed above, you need to change this default setting and instruct GNS3 to use the Gnome Terminal. To accomplish this, do the following instructions:

1. Open GNS3
2. Click on Edit
3. Click on Preferences
4. Click on the Terminal Settings tab
5. In the Terminal Command text box, enter the following statement:

gnome-terminal –command=’telnet %h %p’ >/dev/null 2>&1 &

6. Click on OK.

Watch the video bellow in order to learn use the Gnome Terminal multi-tab feature with GNS3 on Ubuntu.