conntrack software package provides Program to modify the conntrack tables, 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 conntrack
conntrack is installed in your system.
Make ensure the conntrack package were installed using the commands given below,
$ sudo dpkg-query -l | grep conntrack *
You will get with conntrack package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | conntrack |
| Version | 1:1.4.4-5 |
| Description | Program to modify the conntrack tables |
| Sub Section | Net |
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