Its on network/hardware level. The issues with internal DDOS is that they are software related. OVH cannot access your server (or it shouldn't) so the only choi

Its on network/hardware level. The issues with internal DDOS is that they are software related. OVH cannot access your server (or it shouldn't) so the only choice they have is to shut the server and wait till you will fix it. But if you receive DDOS attack to your server from outside, they can defend you using network resources.