Robustel GoRugged R2000 - GRE VPN

Robustel GoRugged R2000 User Guide
RT_UG_R2000_v.1.2.0 15.12.2015 108 /120
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The comparison between point 1 and point 2 is as following picture:
4.2.3 GRE VPN
VPN--->GRE--->GRE