Certainly there is room for more clarity (or, even, any clarity) in defining the question.
I think that the OP is under the impression that there is a very specific 'DDoS log' on Centos, in which there are lists of DDoS attacks and just DDoS attacks. I do not know whether the OP has any evidence of DDoS attacks, but guess that there is some level of concern, for whatever reason.
There is no information about what this particular box is or how it connects to the rest of the world. There doesn't seem to be any point in discussing DDoS attacks on a machine that is unconnected to some kind of networking, but there is no clarification of what connections exists or what traffic needs to exist for the unclear function of the box.
Given how unsure I am about the rest of the OP's post, it really does say something that I have less idea still of what this means. It could be a misprint, it could be a request for an example ip address that has attacked, or one that has been attacked or one that hasn't been attacked or something else. Presumably, the smiley icon is intended to convey the message that this part isn't serious...