Keep process running after ending a ssh session

Hi,

I need to make some continuous ping tests and keep them running for a longer period of time (basically if the time exceeds a given threshold the event would be logged into a file).

I have the simple script ready but I'm not completely sure how to execute it and keep it alive even if I log out from the box (this should run for several days at least). Of course I also need a way to kill the process once I'm done with my testing.