We do not offer a commercial DDoS mitigation solution at this time. However, depending on the size of the attack we may be able to filter the attack or perform specific destination IP based null routes. If it is a larger attack, we may be forced to null route your IP for 24 hours.
More information about DDoS attacks, including how to detect if you are experiencing a DDoS attack, can be found in the article "How can I tell if I'm being attacked?"