In order to start GNS3 from the command line, use the following command:
sudo python gns3
There is no need for the additional options on the command line.
Instructions for installing GNS3 from source
GNS3 is a graphical network simulator. In order to emulate Cisco network devices, the
dynamips emulator will need to be installed as well.
Install the following recommended packages:
sudo apt-get install qt4-dev-tools
sudo apt-get install pyqt4-dev-tools
Before downloading the files for GNS, create the following two
sudo mkdir /opt/GNS3
sudo mkdir /opt/GNS3/Dynamips
Go to the GNS download page
for the latest version (The latest version is 0.8.4-RC2) or download directly from here.
Go to the dynamips download page:
Go to the folder where you downloaded the two files.
- Unpack the GNS files:
sudo tar -jxf GNS3-0.8.4-RC2-src.tar.bz2
Move the files to the
sudo mv GNS3-0.8.2-src/* /opt/GNS3
Move the dynamips binary to the
sudo mv dynamips-0.2.8-RC2-x86.bin /opt/GNS3/Dynamips
Change the permissions on the Dynamips binary to make it executable:
sudo chmod +x /opt/GNS3/Dynamips/dynamips-0.2.8-RC2-x86.bin
- Start GNS3
I would recommend taking a look at the following video from the GNS3 team for further instructions and decent explanation of validating the rest of your GNS3 installation.
GNS3 installation tutorial.
There is also updated GNS3 installation instructions for Linux on the main GNS3 site.