gns3 software package provides Graphical Network Simulator, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gns3
gns3 is installed in your system.
Make ensure the gns3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gns3 *
You will get with gns3 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | gns3 |
| Version | 0.8.7-2 |
| Description | Graphical Network Simulator |
| Sub Section | Net |
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