iodine software package provides tool for tunneling IPv4 data through a DNS server, 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 iodine
iodine is installed in your system.
Make ensure the iodine package were installed using the commands given below,
$ sudo dpkg-query -l | grep iodine *
You will get with iodine package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | iodine |
| Version | 0.7.0-6 |
| Description | tool for tunneling IPv4 data through a DNS server |
| Sub Section | Net |