- public network | private network
- --- encrypt --- plain ---
- |pg0| <------- |VPP| <------ |pg1|
- --- --- ---
+ public network | private network
+ --- encrypt --- plain ---
+ |pg0| <------- |VPP| <------ |pg1|
+ --- --- ---
+
+ --- decrypt --- plain ---
+ |pg0| -------> |VPP| ------> |pg1|
+ --- --- ---