ADSL Moedm--Switch Hub |--Computer 1
______________________|--Computer 2
______________________|--Computer 3
______________________|--Computer 4
______________________|--IP分享器|---Computer 5
_______________________________|---Computer 6

Computer 1
Computer 2
Computer 3
Computer 4
IP分享器
用真實IP

Computer 5
Computer 6
用虛擬IP