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.