fwbuilder software package provides Firewall administration tool GUI, 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 fwbuilder
fwbuilder is installed in your system.
Make ensure the fwbuilder package were installed using the commands given below,
$ sudo dpkg-query -l | grep fwbuilder *
You will get with fwbuilder package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | fwbuilder |
| Version | 5.1.0-4+b2 [amd64, arm64, arme |
| Description | Firewall administration tool GUI |
| Sub Section | Net |
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