dsniff software package provides Various tools to sniff network traffic for cleartext insecurities, 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 dsniff
dsniff is installed in your system.
Make ensure the dsniff package were installed using the commands given below,
$ sudo dpkg-query -l | grep dsniff *
You will get with dsniff package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | dsniff |
| Version | 2.4b1+debian-22.1+b2 [amd64, a |
| Description | Various tools to sniff network traffic for cleartext insecurities |
| Sub Section | Net |