firewalld software package provides dynamically managed firewall with support for network zones, 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 firewalld
firewalld is installed in your system.
Make ensure the firewalld package were installed using the commands given below,
$ sudo dpkg-query -l | grep firewalld *
You will get with firewalld package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | firewalld |
| Version | 0.4.3.3-1 |
| Description | dynamically managed firewall with support for network zones |
| Sub Section | Net |
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