Please forgive me if my question is (as it is) very very basic for your level.
I would like to know how can someone be identified from his IP.
I am working in a little internet services company, new job, and I am handling cases of multiaccounts, which are not allowed. I really am not expert in networking quite at all, it is a secondary aspect of my job but I have to learn more.
The fact is that we are supposed to find out if someone has got more than one account by seeing if more accounts are sharing the same IP.
But then I read that there are different types of IP, a static one, a dynamic one, also you can use a proxy or things like that, so, exactly, how can I be shure that if more accounts share the same IP they are the same person (or at least the same PC)?
1) someone with dynamic IP login with more account at same time. No matter if his IP changes every time he connects, all those account share the same IP so we can be quite shure that something is going on there. Right?
2) someone with a static IP connects with one account one day, another account next day, etc. We can be quite shure that something is going on, right?
3) what about if someone with dynamic IP connect with one account at a time? How can we trace the multiaccounts?
4) The same is for a proxy?
5) If more PC (different people, different accounts, all legal) connect with same IP because they share an internet connection, how can we be shure that they are different PC and not a multiaccount?