This question already has an answer here:
- I am under DDoS. What can I do? 1 answer
Could I get some recommendations on an IPS solutions that incorporates some form of DDOS protection / what do you currently implement on your network?
You could move this question across to security.stackexchange.com - as it is an ideal question for that forum. A couple of us have tested/used DDoS solutions at an enterprise level. The one I am aware of required the ISP and DDoS protection provider to work together so a solution for you may be local specific.