Point blank IP not equal wheel PVP

Well , I have this problem and I imagine that many are and also have people who do not yet know of this problem is by using network " 127.0.0.1 " or hamachi .

But I will explain the problem , put the server in VPS , but when I try to test inside the house can play lan usually less PVP or any activity with the colleague in the same lan , you enter into a room with the user in the same place ie the same IP no active combat, the guest is disconnectado with 10 seconds of starting , and even try to locate it fails in the same room, " GTsource " server contains this little problem is that IP blocking equal in combat .

If any knowledgeable in java unravel would be very grateful , because really for servers that rely on Internet cafes have this problem .

I thank you .