Hi ,
1. Only i use my computer.
2. This problem just happened randomly there is nothing specific I do to initiate it.
3. There is no duplication because when that happed all my other VM are suffering from same problem. If there is IP conflict I will notice it also problem will persist when i start VM not just when decide.
I didnt have that problem when i was with 10.7.x now I'm with 10.8.2 and maybe that is the problem.