VPN   |---------|
           |---------| Siege A |
           |  sur IP |         |
           |         |---------|
           |          
           |          
           |
        -------
        Internet 
        -------         
           |          
           |         
           |          
           |         
           |         |---------|
           |   VPN   | Site XX |        
           |---------| Routeur |       Switch
              sur IP | CPE     |-----[---------]
                     |---------|        |  |  |
                                        |  |  |- Host A
                                        |  |- Host B
                                        |---Host C