fwknop-client software package provides FireWall KNock OPerator client side, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fwknop-client
fwknop-client is installed in your system.
Make ensure the fwknop-client package were installed using the commands given below,
$ sudo dpkg-query -l | grep fwknop-client *
You will get with fwknop-client package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Administration Utilities |
| Package | fwknop-client |
| Version | 1.9.12-3 |
| Description | FireWall KNock OPerator client side |
| Sub Section | Admin |