Hello,
I leave you with a link of the best websites that offers free DDOS/Stresser service to try out your server.
I do not take any responsibility for the use of these sites, by law, you can test these services only on your servers or with the explicit consent.
I don`t own any of these website.
For more info
DONT BE A LEECHER AND LEAVE A LIKE FOR MY WORK! I REPORT THE LEECHERS!