4g8 software package provides Packet Capture and Interception for Switched Networks, 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 4g8
4g8 is installed in your system.
Make ensure the 4g8 package were installed using the commands given below,
$ sudo dpkg-query -l | grep 4g8 *
You will get with 4g8 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | 4g8 |
| Version | 1.0-3.1 |
| Description | Packet Capture and Interception for Switched Networks |
| Sub Section | Net |