如何解决当两个站点间相同内网地址需要打通×××的情景？可以使用NAT+IPSEC ×××的方法，可以参照以下博主的方法，同时贴上NAT处理优先级的官方回答。
http://xuanbo.blog.51cto.com/499334/410541/
Q. Does NAT occur before or after routing?
A. The order in which the transactions are processed using NAT is based
on whether a packet is going from the inside network to the outside
network or from the outside network to the inside network. Inside to
outside translation occurs after routing, and outside to inside
translation occurs before routing. Refer to NAT Order of Operation for
more information.
